Check your PC for viruses, spyware, junk files, and more, with Microsoft Safety Scan
Microsoft Safety Scan is a free and portable (no need to install) program that will search your PC for viruses, spyware, junk files, etc.
This is not a full antivirus application, just a quick solution if you need to perform a virus scan without installing permanently an application.
For a dedicated permanent solution you can get other freeware, check this post about a nice (and free) antivirus solution.
