Hi
Welcome to Microsoft community.
I understand you're experiencing issues with locking your user account on Windows 11. Here are a few troubleshooting steps you can try:
- Check Power & Sleep Settings: Make sure that the "Screen" and "Sleep" settings are configured correctly. Go to "Settings" > "System" > "Power & sleep" and ensure that the screen turns off after a specified period of inactivity.
- Update Graphics Drivers: Outdated or incompatible graphics drivers can cause issues with locking the user account. Visit the manufacturer's website for your laptop's graphics card and download the latest drivers available.
- Disable Fast Startup: Fast Startup is a feature that can interfere with certain functions on your computer. Try disabling Fast Startup by going to "Control Panel" > "Power Options" > "Choose what the power buttons do" > "Change settings that are currently unavailable" > uncheck "Turn on fast startup."
- Run System File Checker: System File Checker is a built-in Windows tool that scans and repairs corrupted system files. Open the Command Prompt as an administrator and run the command "sfc /scannow." Allow the scan to complete and restart your computer.
- Create a New User Account: If the issue persists, try creating a new user account and see if you can lock the account from there. This will help determine if the problem is specific to your user account or a system-wide issue.
Best regards
Derrick Qian | Microsoft Community Support Specialist