When trying to log into a user account on a domain you receive "The Group Police client service failed the login"
1. Log into the system with admin or local admin account.
2. GoTo regedit -> make a backup.
3. GoTo HKEY_LOCAL_MACHINE / SOFTWARE / MICROSOFT / Windows NT / CurrentVersion / ProfileList /
4: Expand the profile list and go through each untill you find the profile at question.
5. Right Click to rename and add _BAD to the end of the profile.
6. Close regedit, Log off and Log on with the profile.
Note: Use at your own RISK!