Microsoft Malicious Software Removal Tool 5.79
Microsoft releases a new version of this tool on the second Tuesday of every month — in other words, on “Patch Tuesday.” It appears as just another patch in Windows Update. If you have your computer set to automatically install Windows Updates, it will be installed automatically. If you install updates manually, you’ve probably been installing it as part of the manual update process — it’s considered an important update, not just a recommended one.
After Windows downloads the newest version of the Microsoft Malicious Software Removal tool, it will automatically run it in the background. This tool checks for specific, widespread types of malware and removes them if it finds them. If everything is fine, Windows will run the tool silently in the background without bothering you. If it finds a infection and fixes it, the tool will display a report telling you which malicious software was detected and will be removed after you restart your computer.
Microsoft introduced this tool back in the days of Windows XP, when Windows was very insecure — the first release of Windows XP didn’t even have a firewall enabled by default. Microsoft’s Malicious Software Removal Tool page says “This tool checks your computer for infection by specific, prevalent malicious software (including Blaster, Sasser, and Mydoom) and helps to remove the infection if it is found.” Note the three types of malware still described here in 2014 — these were widespread worms that infected many Windows XP systems back in 2003 and 2004, ten years ago. Microsoft introduced this tool to purge these widespread worms and other popular types of malware from Windows XP system without antivirus software installed.