1. Rename the user's profile folder to Bob.old

  2. Logged in as an admin, go to Control Panel → User Accounts → Manage User Accounts. Domain accounts show there after an initial login.

  3. Delete the account for Bob

  4. Open regedit and make sure that the user is no longer in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList. Delete it if present, even if it is followed by ".bak".