Microsoft Antivirus has found critical process activity on your PC – pop up

When I visit a site that was referred to me, it pop-ups a message saying that “Microsoft Antivirus has found critical process activity on your PC.” It is suspicious because I know that the pop-up warning originates from the web site and not from my computer. First, there is no such thing as Microsoft Antivirus installed on my computer. Second, I noticed some misspelled words in the alert message. Message that shows on the screen is something like this.

“Microsoft Antivirus has found critical process activity on your PC. You need to clean your computer to prevent system breakage.”

“Potential Threat Details
Microsoft Security Essentials detected potential threats that might compromise your privacy or damage your computer. You need to clean your computer immediately to prevent the system crash.
Trojan PSW.Win32Launch

This warning remains on the browser and I did not click on any buttons nor tried to remove it. I just close the browser and shut down the computer for a while. After a reboot, I scan the computer with my antivirus program and sadly, it found 1 Trojan. Does it mean that my computer got infected during the visit to harmful site? My antivirus cannot remove the threat, what should I do?


  1. pablo77

    It could be a fake warning page setup by malware authors. The main purpose of this page is to deceive computer users and tries to induce them to download a rogue program. Downloading and installing the program may lead to greater risks.

    If your antivirus program is not efficient in removing the virus, you should try other tools. I recommend scanning the computer with MalwareBytes Anti-Malware and Rogue Killer. You don’t have to spend in order to acquire these programs.

    After scanning with the two software, please post back if you will still see “Microsoft Antivirus has found critical process activity on your PC warning.

  2. Liam Roche

    This is surely (criminally) deceptive malware, as becomes clear when it is followed up by a deceptive webpage pretending to be a microsoft popup, and a download of an executable when you attempt to close said popup.

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