Hi,
I would try using one of the online virus scanners to double check and see if any of them pick it up and give you a name for it.
Once you have a name you can search for removal tools (usually on the virus scanners site ) and try and get to the recovery stage. No sense in having toi start over if you can avoid it.
http://www.kaspersky.com/scanforvirus
http://support.f-secure.com/ita/home/ols.shtml
http://home.mcafee.com/Downloads/FreeScan.aspx?ctst=1
Don't be talked into paying for anything from any of these scans though.
And make sure the sites you let run scans or anything on your computer are legitimate. There are evil sites out there posing as good ones.
dr del