go to Houscall & do the free online scan if you don't have an updated reliable scanner for virus.
http://housecall.antivirus.com/
also go here
http://support.microsoft.com/support/kb/articles/q171/7/53.asp
http://housecall.antivirus.com/
also go here
http://support.microsoft.com/support/kb/articles/q171/7/53.asp