The Microsoft Safety Scanner is a free downloadable security tool that provides on-demand scanning and helps remove viruses, spyware, and other malicious software. It works with your existing antivirus software.
This tool is rereleased every few days, and contains the latest virus definitions. It is designed as a single scan, to locate and remove any viruses or spyware.
Link – http://www.microsoft.com/security/scanner/en-gb/default.aspx
Lets hope it works!