I've seem to come into contact with the Virtumonde/Vundo/WinFixer garbage. I've managed to clean several infections with the help of Spybot, Norton and a couple of other handy programs, but there's still a persistant file that cannot be cleaned.
I'ved tried using HJT and Spybot in safe mode, to no avail. The file is:
\Windows\System32\sstts.dll
Logs available on request; help Been fighting with it for weeks