“The User Profile Service Failed the Logon” error is a common Windows 10 issue that can be frustrating to deal with. Fortunately, there are a few simple steps that you can take to fix this problem.

Step 1: Restart Your PC

Before you begin troubleshooting, try restarting your PC. Sometimes, a simple restart can fix many issues. If the error persists after restarting, proceed to the next step.

Step 2: Use Safe Mode

Safe Mode can help determine whether there is a problem with your user profile. To access Safe Mode, restart your PC, and before Windows starts, press the F8 key. Use your arrow keys to select Safe Mode with Networking and press Enter.

In Safe Mode, follow these steps:

1. Press Windows + R to open the Run command.
2. Type “control userpasswords2” and press Enter. This opens the User Accounts window.
3. Select your user account and click the Properties button.
4. Go to the Profile tab and make sure that the “Profile Path” is correct. If the path is incorrect, correct it and click OK.
5. Restart your PC and try logging in as usual.

If the error persists, move to the next step.

Step 3: Create a New User Account

If the problem is with your user profile, creating a new account can help. Follow these steps:

1. Log in as Administrator.
2. Press Windows + R to open the Run command.
3. Type “control userpasswords2” and press Enter. This opens the User Accounts window.
4. Click the Add button to create a new user account.
5. Restart your PC and log in using the new account.

If the error persists, move to the next step.

Step 4: Perform a System Restore

Performing a System Restore can restore your PC to a previous working state. Follow these steps:

1. Press Windows key + R to open the Run command.
2. Type “rstrui.exe” and press Enter. This opens the System Restore window.
3. Select a restore point before the error occurred and click Next.
4. Follow the prompts to complete the restore process.

If the error persists after the restore, move to the next step.

Step 5: Repair Your Windows Installation

If all else fails, repairing your Windows installation may be necessary. Follow these steps:

1. Create a Windows 10 installation media (USB or DVD).
2. Boot your PC from the installation media.
3. Select your language, time, and keyboard preferences, and click Next.
4. Click Install now.
5. Enter your product key if prompted, and click Next.
6. Select the “Custom: Install Windows only (advanced)” option.
7. Select the drive where Windows is installed and click Next.
8. Follow the prompts to complete the repair process.