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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