Vista – The User Profile Service failed the logon. User profile cannot be loaded.
This is a Vista-bug that is caused because Vista takes a backup of your profile but doesnt recreate it. Probably prior to an update.
1. Boot up in Safe Mode.
2. Open RegEdit
3. Navigate to:
You should now have a list of folders all starting with S-1-5- and then a
There should be 2 entries that are the same but one will have .bak at the end. Example image below
The one that’s got .bak at the endshould have a profile path of C:USERS[username] and the one without should have the profile path of C:USERSTemp
You need to swap the .bak to the other profile. ie .bak should be on the entry with the profile path of C:USERStemp. Make sure the entry with profile path C:USERS[username] DOESNT have .bak on the end of it.