User profile service failed the logon

Hi, I've came across such problem before as well and it was fixed by following windows registry hacks.

- Logon to another Administrator account.
- 'regedit' then locate 'HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList'
- In the left pane, look for the S-1-5..... folder (SID key) with the long number that has .bak at the end of the numbers.
- For Two S-1-5..... folders (SID key) with the same Number
  1) In the left pane, right click on the first (top) S-1-5..... folder (SID key) that does not have .bak at the end of the numbers and click Rename.
  2) Add .bk to the end of the numbers.
  3) In the left pane, right click on the second S-1-5..... folder (SID  key) with .bak at the end of the numbers and click Rename.
  4) Remove only .bak from the end of the numbers and press Enter.
  5) Now go back and Rename the first one with .bk to .bak now at the end of the numbers and press Enter.
- In the right pane of the one without .bak now, right click on RefCount  and click on Modify. Type 0 (number) and click on OK.
- In the right pane of the one without .bak now, right click on State  and click on Modify. Type 0 (number) and click on OK.
- Close 'regedit' and restart computer.

For comprehensive instruction, see http://www.vistax64.com/tutorials/130095-user-profile-service-failed-logon-user-profile-cannot-loaded.html
hopefully this helps.

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