go into REGEDIT: Go HKEY_LOCAL_MACHINE > SYSTEM > ControlSet001 > Control > Session Manager > AppCompatibility
inside AppCompatibility open AppCompatCache
copy this text into notepad and search for CA, Pub, VIP... or whatever type of hacks you can think of.. hell search for Hack
EDIT: forgot to mention that if you delete this registry key most of your windows components wont work because they are dependent on this entry.