Home > Ransomware > “McAfee has Blocked your Windows” Lockscreen Virus – Unlock + Remove

“McAfee has Blocked your Windows” Lockscreen Virus – Unlock + Remove

What is “McAfee has Blocked your Windows” lockscreen scam? How to unlock the “McAfee has Blocked your Windows” screen and remove this malware from your computer.

A new lockscreen cam has been detected to lock the screen of victims and ask them to call a fake tech support number. The malware aims to lead victims to a locked screen, claiming that “McAfee has Blocked your Windows”. The virus may then ask victims to provide Security Code to a fake technician hiding behind the phone number (301) 900-8084. This is a scam and a virus that is showing it and this is why if you have it on your computer, you should read this article to learn how to remove it and unlock your screen for free.

Threat Summary

Name McAfee Lockscreen Virus
Type Lockscreen/Scam
Short Description The scammers aim to get you to call (301) 900-8084 and pay money to unlock your screen.
Symptoms Locks your screen and displays a message, claiming it was done by McAfee.
Distribution Method Spam Emails, Email Attachments, Executable files
Detection Tool See If Your System Has Been Affected by malware


Malware Removal Tool

User Experience Join Our Forum to Discuss McAfee Lockscreen Virus.
Data Recovery Tool Windows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

McAfee Lockscreen – How Did I Get It and What Does It Do?

The main method via which is used by the “McAfee has Blocked your Windows” scam is to slither a virus on your computer which tampers heavily with your registry editor. To do this, the malware may be spread via a variety of ways. One of them is to send you a fake e-mail, containing the infection file of the McAfee Lockscreen, whose main idea is to get you to download and run the infection file, thinking it is an important file. Such files are often posing in e-mails as important documents, invoices, receipts and other seemingly sensitive files.

Another way this virus could have ended up on your PC is if you have ran into a malicious web link by random browsing of the web or by being redirected to a virus site. Such sites can land on your PC via an unwanted program, like adware, that may cause a redirect on your browser to third-party sites.

The main screen of the McAfee Lockscreen scam appears like the following:

The screen contains a very convincing message that can get victims to pay, accusing the victimized computer that it has a virus, which could compromise credit card or other critical information.

McAfee has Blocked your Windows
This PC has been blocked because of Suspicious Activity Detected. To Protect the Windows
and it’s members Call McAfee Technical Department (301) 900-8084.
McAfee Security Alert Code: OO5BCCAC9OFEC
Your PC has been blocked because we detected an unusual activity on your computer. McAfee
Your Computer might be Infected by Harmful Viruses.
These viruses are well known for identity and credit card theft.
Further action on this computer or any other device on your network might reveal private information and involve serious risks.
McAfee Technicians will help you getting the Code to Unblock your Computer.
Please Call McAfee Technical Department (301) 900-8084.
Please provide the McAfee Security Alert Code to our Technician.

The end goal of this scam is to lure you into calling (301) 900-8084, where you most likely come in contact with the scammer(s) in question, who could pretend as official McAfee technicians. To fix your problem and unlock your screen, they want you to pay hundreds of dollars and this is the end goal of this scam.

Not only this, but bear in mind that this scam has come on your computer as a result of a virus, and this virus may be actually very dangerous. Besides locking your screen, it could also be capable of:

  • Read and write files.
  • Log the keystrokes you type on your computer.
  • Obtain your personal information.
  • Steal saved passwords.
  • Get your IP and Mac addresses.
  • Get microphone, camera and location information.
  • Damage your files permanently.

This is why, the removal of this virus is stronlgy reccomended. Keep reading this article as it will help you delete this virus and try to restore any files if it has damaged them.

How to Unlock “McAfee has Blocked your Windows” and Remove It Fully

To gain access to your computer, the first step is to unlock your screen. To do this, enter the following unlock key, kindly provided thanks to malware analysts at Malware Hunter Team:


After unlocking your computer, we advise you to act immediately and remove this virus as fast as possible. You can do this by following the removal instructions on steps 1 and 2 if you know which registry entries and files are created by this virus on your computer. If you have no idea how to find them, then the best course of action for removing “McAfee has Blocked your Windows” is to download and run a scan with a specific anti-malware software. It aims to scan your computer for all of the virus files, belonging to “McAfee has Blocked your Windows” and remove them fully, plus protect your computer in the future too.

Although there is minimal chance that the “McAfee has Blocked your Windows” lockscreen has done any damage to your files, if you cannot open them, you can see the “Try to restore” step below. It has methods for file recovery, that can help a lot, if you have lost some or all of your files as a result of this virus.

Ventsislav Krastev

Ventsislav is a cybersecurity expert at SensorsTechForum since 2015. He has been researching, covering, helping victims with the latest malware infections plus testing and reviewing software and the newest tech developments. Having graduated Marketing as well, Ventsislav also has passion for learning new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management, Network Administration and Computer Administration of System Applications, he found his true calling within the cybersecrurity industry and is a strong believer in the education of every user towards online safety and security.

More Posts - Website

Follow Me:

Attention! SensorsTechForum strongly recommends that all malware victims should look for assistance only by reputable sources. Many guides out there claim to offer free recovery and decryption for files encrypted by ransomware viruses. Be advised that some of them may only be after your money.

As a site that has been dedicated to providing free removal instructions for ransomware and malware since 2014, SensorsTechForum’s recommendation is to only pay attention to trustworthy sources.

How to recognize trustworthy sources:

  • Always check "About Us" web page.
  • Profile of the content creator.
  • Make sure that real people are behind the site and not fake names and profiles.
  • Verify Facebook, LinkedIn and Twitter personal profiles.


with Anti-Malware
We recommend you to download SpyHunter and run free scan to remove all virus files on your PC. This saves you hours of time and effort compared to doing the removal yourself.
SpyHunter 5 free remover allows you, subject to a 48-hour waiting period, one remediation and removal for results found. Read EULA and Privacy Policy

About the McAfee Lockscreen Virus Research

The content we publish on SensorsTechForum.com, this McAfee Lockscreen Virus how-to removal guide included, is the outcome of extensive research, hard work and our team’s devotion to help you remove the specific malware and restore your encrypted files.

How did we conduct the research on this ransomware?

Our research is based on an independent investigation. We are in contact with independent security researchers, and as such, we receive daily updates on the latest malware and ransomware definitions.

Furthermore, the research behind the McAfee Lockscreen Virus ransomware threat is backed with VirusTotal and the NoMoreRansom project.

To better understand the ransomware threat, please refer to the following articles which provide knowledgeable details.


1. How to Recognize Spam Emails with Ransomware
2. How Does Ransomware Encryption Work?
3. How to Decrypt Ransomware Files
4. Ransomware Getting Greedier and Bigger, Attacks Increase by 40%
5. 1 in 5 Americans Victim of Ransomware

Windows Mac OS X

How to Remove McAfee Lockscreen Virus from Windows.

Step 1: Boot Your PC In Safe Mode to isolate and remove McAfee Lockscreen Virus


Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter

Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows Key + R.

2. The "Run" Window will appear. In it, type "msconfig" and click OK.

3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".

Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.

4. When prompted, click on "Restart" to go into Safe Mode.

5. You can recognise Safe Mode by the words written on the corners of your screen.

Step 2: Uninstall McAfee Lockscreen Virus and related software from Windows

Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:

1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.

2. In the field type in "appwiz.cpl" and press ENTER.

3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"

Follow the instructions above and you will successfully uninstall most programs.

Step 3: Clean any registries, created by McAfee Lockscreen Virus on your computer.

The usually targeted registries of Windows machines are the following:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

You can access them by opening the Windows registry editor and deleting any values, created by McAfee Lockscreen Virus there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.

2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.

3. You can remove the value of the virus by right-clicking on it and removing it.

Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.

Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.

Step 4: Scan for McAfee Lockscreen Virus with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.

It is recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.

2. After you have installed SpyHunter, wait for it to update automatically.


3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.


4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.


If any threats have been removed, it is highly recommended to restart your PC.

Video Guide for Automatic and Fast Removal

Step 5 (Optional): Try to Restore Files Encrypted by McAfee Lockscreen Virus.

Ransomware infections and McAfee Lockscreen Virus aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the recommended Data Recovery software by clicking on the link underneath:

Simply click on the link and on the website menus on the top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.

Step 6: How to Restore Files Encrypted by Ransomware (Video Guide)

Windows Mac OS X

Get rid of McAfee Lockscreen Virus from Mac OS X.

Step 1: Uninstall McAfee Lockscreen Virus and remove related files and objects

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your Mac with SpyHunter for Mac
Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy

1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:

2. Find Activity Monitor and double-click it:

3. In the Activity Monitor look for any suspicious processes, belonging or related to McAfee Lockscreen Virus:

Tip: To quit a process completely, choose the “Force Quit” option.

4. Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.

5. In the Applications menu, look for any suspicious app or an app with a name, similar or identical to McAfee Lockscreen Virus. If you find it, right-click on the app and select “Move to Trash


6. Select Accounts, after which click on the Login Items preference.

Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to McAfee Lockscreen Virus. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.

7. Remove any left-over files that might be related to this threat manually by following the sub-steps below:

  • Go to Finder.
  • In the search bar type the name of the app that you want to remove.
  • Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
  • If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.

In case you cannot remove McAfee Lockscreen Virus via Step 1 above:

In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as McAfee Lockscreen Virus. If you believe there is no such file, do not delete anything.

You can repeat the same procedure with the following other Library directories:

→ ~/Library/LaunchAgents

Tip: ~ is there on purpose, because it leads to more LaunchAgents.

Click the button below below to download SpyHunter for Mac and scan for McAfee Lockscreen Virus:


SpyHunter for Mac

Step 3 (Optional): Try to Restore Files Encrypted by McAfee Lockscreen Virus.

Ransomware infections and McAfee Lockscreen Virus aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the recommended Data Recovery software by clicking on the link underneath:

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.

McAfee Lockscreen Virus FAQ

What is McAfee Lockscreen Virus ransomware and how does it work?

McAfee Lockscreen Virus is a ransomware infection - the malicious software that enters your computer silently and blocks either access to the computer itself or encrypt your files.

Many ransomware viruses use sophisticated encryption algorithm how to make your files inaccessible. The goal of ransomware infections is to demand that you pay a ransom payment to get access to your files back.

How does McAfee Lockscreen Virus ransomware infect my computer?

Via several ways.McAfee Lockscreen Virus Ransomware infects computers by being sent via phishing e-mails, containing virus attachment.

This attachment is usually masked as an important document, like an invoice, bank document or even a plane ticket and it looks very convincing to users.

After you download and execute this attachment, a drive-by download occurs and your computer is infected with the ransomware virus.

Another way, you may become a victim of McAfee Lockscreen Virus is if you download a fake installer, crack or patch from a low reputation website or if you click on a virus link. Many users report getting a ransomware infection by downloading torrents.

How to open .McAfee Lockscreen Virus files?

You can't. At this point the .McAfee Lockscreen Virus files are encrypted. You can only open them once they are decrypted.

Decryptor did not decrypt my data. What now?

Do not panic and backup the files. If a decryptor did not decrypt your .McAfee Lockscreen Virus files successfully, then do not despair, because this virus is still new.

One way to restore files, encrypted by McAfee Lockscreen Virus ransomware is to use a decryptor for it. But since it's a new virus, advised that the decryption keys for it may not be out yet and available to the public. We will update this article and keep you posted as soon as this decryptor is released.

How Do I restore ".McAfee Lockscreen Virus" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore .McAfee Lockscreen Virus files.

These methods are in no way 100% guarantee that you will be able to get your files back. But if you have a backup, your chances of success are much greater.

How do I get rid of McAfee Lockscreen Virus ransomware virus?

The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti malware software. It will scan for and locate McAfee Lockscreen Virus ransomware and then remove it without causing any additional harm to your important .McAfee Lockscreen Virus files.

Also, keep in mind that viruses like McAfee Lockscreen Virus ransomware also install Trojans and keyloggers that can steal your passwords and accounts. Scanning your computer with an anti-malware software will make sure that all of these virus components are removed and your computer is protected in the future.

What to Do If nothing works?

There is still a lot you can do. If none of the above methods seem to work for you, then try these methods:

  • Try to find a safe computer from where you can can login on your own line accounts like One Drive, iDrive, Google Drive and so on.
  • Try to contact your friends, relatives and other people so that they can check if they have some of your important photos or documents just in case you sent them.
  • Also, check if some of the files that were encrypted it can be re-downloaded from the web.
  • Another clever way to get back some of your files is to find another old computer, a flash drive or even a CD or a DVD where you may have saved your older documents. You might be surprised what will turn up.
  • You can also go to your email account to check if you can send any attachments to other people. Usually what is sent the email is saved on your account and you can re-download it. But most importantly, make sure that this is done from a safe computer and make sure to remove the virus first.

More tips you can find on our forums, where you can also asks any questions about your ransomware problem.

How to Report Ransomware to Authorities?

In case your computer got infected with a ransomware infection, you can report it to the local Police departments. It can help authorities worldwide track and determine the perpetrators behind the virus that has infected your computer. Below, we have prepared a list with government websites, where you can file a report in case you are a victim of a cybercrime:

Cyber-security authorities, responsible for handling ransomware attack reports in different regions all over the world:

Reports may be responded to in different timeframes, depending on your local authorities.

1 Comment
  1. SOLER Anne

    comment et où entrer la clé de dévérouillage à l’écran je peux avoir : continuer / éteindre / dépannage Je n’ai pas trouvé d’endroit où je puisse inscrire cette clé


Leave a Comment

Your email address will not be published. Required fields are marked *