If you use hotmail they scan for viruses before you get them....you could also check this site out it is an online virus checker HOUSECALL ANTI-VIRUS: http://housecall.antivirus.com/housecall/start_corp.asp
it will also check for trojans they can be more harful than a virus because you never know when you have one untill the day you can't log onto anything cause someone has changed your passwords.