Vista - The User Profile Service failed the logon.

Fix the User Account Profile:

1. Start Menu >> Start Search, type regedit and press Enter

2. goto HKey_Local_Machine\Software\MicroSoft\Windows NT\CurrentVersion\ProfileList

3. At the left pane, look for S-1-5...... folder (SID) that has .bak at the end

4. At the right pane, look for ProfileImagePath to verify the user account with error.

5. The folder with no .bak, rename and put .bk at the end

6. For the folder with .bak, remove the .bak at the end

7. In the right pane of the one without .bak now, right click on RefCount and click on Modify.

8. In the right pane of the one without .bak now, right click on State and click onModify

9. Close Regedit

10. Restart