I'll copy and paste my answer from sacreligions same thread the other day:
It was probably the av.exe Trojan. It disguises itself as an anti virus security program and fake scans your system.
It sits in a temp folder and duplicates itself everytime you think it's gone.
There's only a handful of programs that recognize it right now; one of them bing SUPERantispyware or whatever it is. I also think kaspersky recognizes it.