http://securityresponse.symantec.com...tophijack.html if you have Norton/Symantec
http://us.mcafee.com/virusInfo/defau...virus_k=134451 if you have mcafee

It changes the desktop wallpaper to a BSOD imitation it seems. You may be able to remove it following instruction on those sites.

EDIT: Wow, I though I had first post but both of you had to steal it away.