To Fix “The User Profile Service Failed the Logon” on Windows OS, the following methods should be used. Let us start with the Scanning Process with Command Prompt.

Method 1: Scan Corrupted Files

Step 1: First, Enter into Safe Mode

Step 2: Run Command Prompt as an administrative

Step 3: Type the below-mentioned command > Press Enter

Command: Sfc /scannow

Step 4: After the scan is completed 100%, restart your computer and try logging in again.

Method 2: Enable Admin Account

Step 1: Click the Power icon, then press and hold Shift and click Restart

Step 2: After restart, select Troubleshoot

Step 3: Open Command Prompt from Advanced Options.

Step 4: Type regedit and press Enter.

Step 5: Navigate to HKEY_LOCAL_MACHINE > Load Hive > This PC > Windows > System32

Step 6: Find and double-click on the config folder

Step 7: Find the SAM file and double-click on it

Step 8: In the dialog box, write Key Name – REM_SAM and click OK.

Step 9: Navigate to “HKEY_LOCAL_MACHINE\REM_SAM\SAM\Domains\Account\Users\000001F4” in the registry editor.

Step 10: Double-click on the “F” binary value

Step 11: Go to the “00000038” entry in the first row

Step 12: Modify the value “11” in the second column to “10“

Step 13: Click OK to save the changes.

Step 14: Exit the registry editor window

Step 15: Close the Command Prompt

Step 16: Click “Continue” to boot to the lock screen. After enabling the built-in admin account, don’t log in directly to this account. Instead, first boot Windows in Safe Mode to ensure it functions properly. Then, log in to the built-in administrator account and proceed with the next methods.

Method 3: Replace Corrupt NTUSER.DAT File

Step 1: Press Win + R and type services. the msc in the Run dialog box.

Step 2: Now, click Views > Shows > Hidden items

Step 3: Navigate to This PC > Local Disk (C:) > Users > Default

Step 4: Rename the NTUSER.DAT file to NTUSER.DAT.OLD

Step 5: Now, Paste the copied file into the Default folder

Step 6: To implement the changes, restart your computer.

Method 4: Create a New User Account

Note: Please ensure that your user profile files are backed up before continuing.

Step 1: Open Windows Settings choose Accounts > Other Users and click Add account

Step 2: Now click I don’t have this person’s sign-in information.

Step 3: Click Add a user without a Microsoft account.

Step 4: Enter User Name, Password, Confirm Password and Security Hints. Click the indicates button.

Step 5: Restart your PC to log in to your new user account

Method 5: Enable User Profile Service

Step 1: Enter into safe mode by following the steps.

Restart PC > Hold Shift > Troubleshoot > Advanced Options > Startup Settings > Restart > Press F4 or F5

Step 2: Copy-paste the following commands one by one and hit Enter.

sc config ProfSvc start= auto
sc start ProfSvc

Step 3: Restart your PC again to exit safe mode.

Method 6: Enable User Profile Service via Registry Settings

Step 1: Press Win + R and type regedit in the Run dialog box.

Step 2: Navigate to HKEY_LOCAL_MACHINE > Software > Microsoft > Windows NT > CurrentVersion > ProfileList.

Step 3: Find the corrupted profile by checking each S-1-5 folder’s ProfileImagePath to match your profiles.

Step 4: Change RefCount and State values to zero for the corrupted profile, then restart your computer.