Saturday, 2 April 2016

How to fix a Windows (Vista, 7 or 10) Corrupt User Profile: The User Profile Service failed the logon


This method has the potential to cause more harm, so it's best followed only by more advanced users. Remember to backup your Registry following the instructions at the start of this article.

STEP 1: LAUNCH REGEDIT
Restart your computer and boot into Safe Mode, following the instructions at the start of the article. Click on the Start menu, type Regedit and hit Enter to start the Registry Editor.
Using the left-hand panel, browse to HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows NT/CurrentVersion/ProfileList. You'll see some folders with the name starting S-1-5 followed by a long number. Click on each one in turn, then in the Main Window look at the ProfileImagePath and make sure it's the account with the problem. This is the name of the user folder and contains the name of the username it relates to.
If you have two folders for your username, and one ends in .bak, you need to do this: right-click the folder that doesn't have .bak in it, select rename and add '.ba' to the end of the name. Rename the folder with .bak in it, deleting the .bak part of the name. If you have one folder with a .bak at the end, rename to remove the .bak part.

STEP 2: CHANGE REFCOUNT
Select the folder with the .bak in the name, then in the main Window double-click RefCount. Change the Value data to 0, then click OK. Close the Registry Editor and Restart your computer, and you can now login to your existing account. If you have further problems, you can restore your original Registry settings following the instructions at the start of this article, then follow Method 1 to repair your corrupted user profile.
WINDOWS 10 FIX

If you've encountered the 'User Profile Service failed the logon' error in Windows 10, there's a slightly different fix but it requires you to have access to another Windows 10 system. All you need to do is copy the 'C:\Users\Default' folder from a second, non-problematic PC over to your problem PC and pasting it in the same location. Rename the existing folder on your problem PC to something else, just in case you ever need to revert back for any reason. To access the 'Default' folder on your second PC you'll need to turn on hidden files by clicking 'View' in the folder toolbar and selecting 'Hidden items'.


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