You have a domain credential. You need to strip domain rights out of the system. The best way forward is to either wipe and start fresh or create a local user account to use as your new primary. You can likely pull the app data folders over into the new user as well as the documents and desktop folders. If you move the data you need, you can then delete the user folder for the old account. Most registry changes for domain users are Current_User entries which means you will have a clean registry as well.