How to run an antivirus scan for free, no need to download.

Before calling IT support you may wish to run an antivirus tool which is built into Windows. Microsoft’s “coded name” for it is Windows Malicious Software Removal Tool. You do not have to download any program. The free Microsoft antivirus tool is already installed on every Windows PC. This is not a full-blown antivirus but it removes most widespread viruses if they are active on your computer. The free antivirus removal tool updates and runs itself automatically together with Microsoft Updates. There is no desktop shortcut to run this tool. To run it press Windows logo key + R , type MRT and hit enter.
If you get an error message while running this antivirus, this could mean your computer infected with the virus. Some viruses disable this and other antiviruses on infected computers.
This free antivirus tool works on Windows 7, Windows Vista, Windows XP, Windows Server 2003, and Windows Server 2008