The “virus” is definitely Windows AntiVirus 2008 (have a look at http://www.avira.com/en/security_news/faked_anti-virus_solution.html if you are not sure) and in itself is not a virus, but a very nasty bit of AdWare that downloads some very nasty things to your comp, the 1st case I came across had downloaded (amongst other things) a worm which destroyed the operating system, and in yet another case had downloaded (a) a keylogger which records every key stroke you make and then sends the information back to a remote comp, i.e. bank details, passwords etc, in all cases so far I have not fixed a comp with less than 100 “viruses” etc on them. This “nasty” is easily picked up from P2P sites like LimeWire etc because too many people do not have adequate protection.
How to get rid of it
One of the easiest ways is to go to http://www.trendsecure.com/portal/en-US/tools/security_tools/housecall and run the free online scan, this will get rid of any “viruses” etc.
Next download the best antivirus I have found
( http://www.avira.com/en/pages/index.php)
it will only cost £26.95 (39.95 euros) and is a complete security suite in that it fully protects your comp ( if you cant afford the full version at least download the free version)
If you do go with Avira make sure you uninstall any other antivirus
Next download a peice of software called CCleaner http://www.filehippo.com/download_ccleaner/ it’s free and will keep your computer running smoothly by removing up any hidden crap in your temp files, cache, etc
Hope this helps
PS get rid of LimeWire etc if I had my way I would have all P2P sites closed down this is how 99% of all “viruses” spread,