It's called Rogue Scanner a.k.a. Fake Antivirus...
It's a big news header in my magazine in my country (CHIP, October 2009 edition probably).
There are a lot naming of that fake-av, usually they will name theirselves something similar to real AV, such as WinDefender (the right one is Windows Defender). Actually it's a trojan downloader, and whenever you click something like 'Scan My PC', it will shows a lot of viruses, spyware that never exist in your PC. and when you click the 'Clean/Disinfect or something', it will download more trojans to ur PC. there are several ways to solve it:
=>download their remover tools (you can try googling)
=>If u r rich enough, use a premium anti-virus.. it should work (i suggest Norton AV 2010 or AVG 9 Pro)
=>if u r an original Windows user,
click here, to get the remote assistance.
=>but if you're an user of the cracked one, you can
click here to remove them manually.
Tell me if it's works (just reply this post, i don't like PM)
And don't bother to ask for help!!!
