Virus Alert from Microsoft “This Computer is Blocked” Scam

Parasite may reinstall itself multiple times if you don't delete its core files. We recommend downloading SpyHunter to scan for malicious programs installed with it. This may save you hours and cut down your time to about 15 minutes. 

Download SpyHunter Anti-Malware

More information on SpyHunter, steps to uninstallEULAThreat Assessment Criteria, and Privacy Policy.

This page aims to help you remove Virus Alert from Microsoft “This Computer is Blocked” Scam. Our removal instructions work for Chrome, Firefox and Safari, as well as every version of Windows and MacOS.

Virus Alert from Microsoft “This Computer is Blocked”

Virus Alert from Microsoft “This Computer is Blocked” is a browser type of fraud that aims to trick people into thinking that Microsoft has detected an infection or threat in their computer and has blocked it. The phone number provided is fraudulent, and you should not, under any circumstances, call any of the numbers listed.

Virus Alert from Microsoft This Computer is Blocked

The Virus Alert from Microsoft “This Computer is Blocked” Scam is displayed through pop up ads that redirect you to sites that display this scam.

Most ads you are likely to encounter on the Internet are probably going to be coming from the sites you visit since a lot of websites nowadays use paid ads to financially support their owners and developers. There isn’t much you can do about that no matter how annoying these web ads may be. The best you could do to avoid the advertisements is to either get an ad-blocking tool to stop at least some of them or to altogether stop visiting the sites with overly aggressive sites. But what if the ads and the random page-redirects follow you on every site and page and actually seem to be coming directly from your browser. Well, if that’s the case, then you probably have a hijacker on your browser (Firefox or Chrome or any other) which may have also replaced the homepage, the search engine, some of the toolbar buttons and made other changes to the browser since this is what browser hijacker tend to do. They are like browser add-ons, only way more irritating and a lot let useful. Still, to your relief, they are not insidious and malicious pieces of malware and are not supposed to mess with your system and files in the same way a Trojan Horse program or a Ransomware cryptovirus could. Still, though not particularly dangerous, due to their ability to spam your browsers with adverts and and page redirects and other commercial materials like banners, flashy box messages and pop-ups, the majority of hijackers are seen as undesirable and unwanted. Add to that the fact that they can make changes to any browser they get installed on without even asking the user for a permission and without allowing them to revoke the changes and you have yourself one quite unpleasant piece of software. Below, you can learn how to deal with such apps as the next removal guide manual will show you how to uninstall Virus Alert from Microsoft “This Computer is Blocked” which is one recently reported hijacker.

Can they be dangerous?

Not all potentially hazardous pieces of software are necessarily created for the purpose of causing issues and harming you. A typical hijacker app, for instance, is mostly developed to make profits from web ads and from generating traffic to different promoted sites. However, though its purpose isn’t normally malicious, there are still potential hazards that could be related to it. For instance, Virus Alert from Microsoft “This Computer is Blocked” may show you adverts that aren’t really what they seem and once you click on them you might find yourself on some obscure site with questionable contents. This is how you can easily get your machine targeted with nasty infections like Ransomware, Trojan Horse programs, Spyware and so on. That is why we generally advise the readers of our posts to not allow apps like Virus Alert from Microsoft “This Computer is Blocked” to stay active on their machines. Use our guide or the removal software we’ve included in it and, through them, ensure that you no longer have the nagging ad-generating software on your PC. Also, be careful in the future while surfing the Internet and avoid any type of content and software that may be unreliable and unsafe so as to prevent the installation of any more hijackers in the future.


Name Virus Alert from Microsoft “This Computer is Blocked”
Type Browser Hijacker
Danger Level Medium (nowhere near threats like Ransomware, but still a security risk)
Symptoms  A typical symptom of the presence of a hijacker inside your PC are the changes that it is likely to make to the search engine, the toolbar and/or the starting page and new-tab page addresses of your browser.
Distribution Method It can be distributed through spam message campaigns, through the use of installation bundles and setup packages and also via misleading web offers and prompts.
Detection Tool

Remove Virus Alert from Microsoft “This Computer is Blocked” Scam

If you have a Windows virus, continue with the guide below.

If you have a Mac virus, please use our How to remove Ads on Mac guide.

If you have an Android virus, please use our Android Malware Removal guide.

If you have an iPhone virus, please use our iPhone Virus Removal guide


Some of the steps will likely require you to exit the page. Bookmark it for later reference.

Reboot in Safe Mode (use this guide if you don’t know how to do it).



We get asked this a lot, so we are putting it here: Removing parasite manually may take hours and damage your system in the process. We recommend downloading SpyHunter to see if it can detect parasite files for you.

Press CTRL + SHIFT + ESC at the same time and go to the Processes Tab (the “Details” Tab on Win 8 and 10). Try to determine which processes are dangerous. 


Right click on each of them and select Open File Location. Then scan the files with our free online virus scanner:

Drag and Drop Files Here to Scan
Maximum file size: 128MB.

This scanner is free and will always remain free for our website's users. You can find its full-page version at:

Scan Results

Virus Scanner Result

After you open their folder, end the processes that are infected, then delete their folders. 

Note: If you are sure something is part of the infection – delete it, even if the scanner doesn’t flag it. No anti-virus program can detect all infections. 


Hold together the Start Key and R. Type appwiz.cpl –> OK.


You are now in the Control Panel. Look for suspicious entries. Uninstall it/them.

Type msconfig in the search field and hit enter. A window will pop-up:


Startup —> Uncheck entries that have “Unknown” as Manufacturer or otherwise look suspicious.


To remove parasite on your own, you may have to meddle with system files and registries. If you were to do this, you need to be extremely careful, because you may damage your system.

If you want to avoid the risk, we recommend downloading SpyHunter
a professional malware removal tool.

More information on SpyHunter, steps to uninstallEULAThreat Assessment Criteria, and Privacy Policy.

Hold the Start Key and R –  copy + paste the following and click OK:

notepad %windir%/system32/Drivers/etc/hosts

A new file will open. If you are hacked, there will be a bunch of other IPs connected to you at the bottom. Look at the image below:

hosts_opt (1)

If there are suspicious IPs below “Localhost” – write to us in the comments.

Open the start menu and search for Network Connections (On Windows 10 you just write it after clicking the Windows button), press enter.

  1. Right-click on the Network Adapter you are using —> Properties —> Internet Protocol Version 4 (ICP/IP), click  Properties.
  2. The DNS line should be set to Obtain DNS server automatically. If it is not, set it yourself.
  3. Click on Advanced —> the DNS tab. Remove everything here (if there is something) —> OK.



  • After you complete this step, the threat will be gone from your browsers. Finish the next step as well or it may reappear on a system reboot.

Right click on the browser’s shortcut —> Properties.

NOTE: We are showing Google Chrome, but you can do this for Firefox and IE (or Edge).


Properties —–> Shortcut. In Target, remove everything after .exe.

ie9-10_512x512  Remove Virus Alert from Microsoft “This Computer is Blocked” from Internet Explorer:

Open IE, click  IE GEAR —–> Manage Add-ons.

pic 3

Find the threat —> Disable. Go to IE GEAR —–> Internet Options —> change the URL to whatever you use (if hijacked) —> Apply.

firefox-512 Remove Virus Alert from Microsoft “This Computer is Blocked” from Firefox:

Open Firefoxclick  mozilla menu  ——-> Add-ons —-> Extensions.

pic 6

Find the adware/malware —> Remove.
chrome-logo-transparent-backgroundRemove Virus Alert from Microsoft “This Computer is Blocked” from Chrome:

Close Chrome. Navigate to:

 C:/Users/!!!!USER NAME!!!!/AppData/Local/Google/Chrome/User Data. There is a Folder called “Default” inside:

Rename the Folder to Backup Default

Rename it to Backup Default. Restart Chrome.


Type Regedit in the windows search field and press Enter.

Inside, press CTRL and F together and type the threat’s Name. Right click and delete any entries you find with a similar name. If they don’t show up this way, go manually to these directories and delete/uninstall them:

  • HKEY_CURRENT_USER—-Software—–Random Directory. It could be any one of them – ask us if you can’t discern which ones are malicious.
    HKEY_CURRENT_USER—-Software—Microsoft—-Windows—CurrentVersion—Run– Random
    HKEY_CURRENT_USER—-Software—Microsoft—Internet Explorer—-Main—- Random

If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you can always ask us in the comments for help!

Leave a Comment