Most antivirus programs identify msscan.exe as malware—e.g. TrendMicro identifies it as TROJ_GEN.R039C0WK917 or TROJ_GEN.R00EC0WKC17, and Symantec identifies it as Trojan.Gen.2.
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Description: Msscan.exe is not essential for Windows and will often cause problems. The msscan.exe file is located in a subfolder of the user's profile folder (mostly C:\Users\USERNAME\AppData\Roaming\Microsoft\).
Known file sizes on Windows 10/8/7/XP are 300,032 bytes (33% of all occurrences), 58,368 bytes or 58,880 bytes.
The program has no visible window. The application starts when Windows starts (see Registry key: User Shell Folders). Msscan.exe is not a Windows system file. Msscan.exe is able to monitor applications. Therefore the technical security rating is 85% dangerous, but you should also take into account the user reviews.
Recommended: Identify msscan.exe related errors
Important: You should check the msscan.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.
The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active msscan process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the msscan.exe on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.
A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.
Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.