is it in the C: drive? Is the file just "~"? There is nothing like that at Symantic about a virus. Is your Norton anti-virus active?
Definatly get Adaware. You can get it at Cnet.com, or this site, http://www.answersthatwork.com/home_page.htm,
great place to find stuff. Got to libraries at the site, under downloads, internet access. Also get Zone alarm, if you don't want to pay for a firewall. Works just fine. Haven't had a problem in the 2 years I have had it. Also, Popup Blocker. All 3 should have free versions.
Tight click on the file and see what its properties are.