What the problem is: the user profile service failed the logon and give you an error when attempting to login to windows.
What is causing said problem: Windows updates sometimes will not install correctly and thus making the user profile corrupt and inaccessible or a malicious piece of software has corrupted your user profile.
How to fix a Corrupt Windows Profile:
- Start the PC in Safe Mode and open the default account (most likely administrator)
- Open up the run command and type in “regedit” and then hit ok
- Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
There is one line for each profile. If a profile is bad:
- Add the suffex “_new” followed by removing “.bak” from the simliar entry above
Make any necessary changes, close Regedit and try to log in as that user.