I can access Task Manager, regedit and Windows Updates (just recently updated to SP1).
MBAM : clean
Avast : still scanning
Hitman Pro : Shows Explorer.exe : Malware (Medium Risk Malware) Prevx : Quarantine. -Edit: WPF replaced Explorer, I think it's because I used a custom start orb.
Could it be because I use Custom Themes and Start Orb?
Also before avast! detected the file, it was dated 15th Feb (from within Windows Explorer).