TMP3B3.tmp and
TMP3B4.tmp
in my temp folder.
Sophos Antivirus says its virus/spyware, but it doesn't show up after scans, so I can't clean it up.
Can't delete them either:
"Cannot delete tmp3b3.tmp: Access is denied. Make sure the disk is not full or write-protected and that the file is not currently in use"

What should I do?

try these

http://www.superantispyware.com/

http://www.malwarebytes.org/

http://download.bleepingcomputer.com/sUBs/ComboFix.exe

http://www.bleepingcomputer.com/forums/lofiversion/index.php/t99382.html

http://www.bleepingcomputer.com/forums/lofiversion/index.php/t99382.html

Thanks, good stuff!
:)
Ill try it out in a bit.