If you do not have an anti virus program, then you need to get a copy of AVG8.5FREE from Grisoft.... make sure you download the FREE version from the options.... after downloading and installing, you should get the latest updates and then run a COMPLETE SCAN .... this could take 2 or 3 hours, so leave it running and go out for a long walk!....
After it has finished the scan, it will report any virus found and will have it in quarantine, for you to dispose of as per instructions...
The AVG program is FREE and will update itself every day FREE and automatically, you can schedule it to scan your computer every day at a specified time....
Good luck
Gerry
April 2009