I think you may be infected with one of the versions of "Antivirus 20xx"
Here is a link with instructions on removal. I took the first resuls from google so there are other options. google "Antivirus 2001 removal"
As a side note, it is very easy to get, and a pain in the ass to remove. Only antivirus program I have ever had to catch it was Kaspersky..
There was also a thread about this on here... lets see if I can find it
Here is the previous thread
http://www.cigarasylum.com/vb/showth...=virus+removal and it has some good info as well