The usual cause of this issue is a corrupted user profile due to a sudden shutdown, disk errors, or system updates. Other causes include wrong permissions on the profile directory and registry issues. Before trying the solutions below, we recommend restarting your computer. If the issue persists, try the following methods:
Important Step: Boot Windows in Safe Mode
To follow the methods below, boot in Safe Mode. Safe Mode only loads essential services and drivers, which can help diagnose and resolve problems.
1. Edit Registry Profile Entry
Windows Registry contains a key named ‘ProfileList’ that stores info about user profiles. Each user profile is represented by a unique subkey under ‘ProfileList’, which includes various settings and paths related to that user’s profile. Sometimes, duplicate or corrupted entries in this key can cause user profile errors, like “The User Profile Service failed the logon.” Editing the registry incorrectly can cause system instability or prevent Windows from running correctly. Follow the instructions precisely and only make changes if you’re confident. It’s also advisable to back up the registry before making changes.
2. Replace NTUSER.DAT
The NTUSER.DAT file contains your individual configurations and settings; if it becomes corrupt, it could be the direct reason for login issues. By renaming the old file and copying a working version from another profile, you effectively reset your profile’s state, which can fix any errors preventing you from signing in.
3. Use System Restore
System Restore can revert Windows to an earlier state using a restore point, which may fix various issues, including driver corruption and the current login error. Note: Although the System Restore method only works if a restore point exists prior to having this problem, Windows often creates restore points automatically during updates or software installs. Hence, try this method as your system might already have an existing restore point.
4. Restart the User Profile Service
The User Profile Service is crucial for user logon management in Windows. If it’s not running due to a glitch or configuration issue, users may be unable to log into their accounts, thus causing the error message. By restarting the service and setting it to Automatic, you’ll make sure it’s active and ready to manage user profiles as soon as the system boots up, hence resolving any login issues.
5. Create a New User Account
By creating a new user account, you remove any potential corruption in the profile that’s causing the logon issue. The new user account essentially acts as a clean slate and, if successful, provides a path to smoothly transition your personal files without the issues of the previous account’s errors.
6. Switch to Normal Startup
Selectively disabling Microsoft services during a clean boot can result in various errors. Make sure no Microsoft services are disabled and consider switching back to a normal startup, which enables all drivers and services.
7. Reset or Reinstall Windows
If the error persists, consider resetting or reinstalling Windows as a last resort. Follow the link to learn how to perform a clean installation.
