When the Windows Security Center is blank or the function is missing, you can follow the following steps to check: 1. Confirm whether the system version supports full functions, some functions of the Home Edition are limited, and the Professional Edition and above are more complete; 2. Restart the SecurityHealthService service to ensure that its startup type is set to automatic; 3. Check and uninstall third-party security software that may conflict; 4. Run the sfc/scannow and DISM commands to repair system files; 5. Try to reset or reinstall the Windows Security Center application, and contact Microsoft support if necessary.

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When encountering the "SYSTEM_SERVICE_EXCEPTION" blue screen error, you do not need to reinstall the system or replace the hardware immediately. You can follow the following steps to check: 1. Update or roll back hardware drivers such as graphics cards, especially recently updated drivers; 2. Uninstall third-party antivirus software or system tools, and use WindowsDefender or well-known brand products to replace them; 3. Run sfc/scannow and DISM commands as administrator to repair system files; 4. Check memory problems, restore the default frequency and re-plug and unplug the memory stick, and use Windows memory diagnostic tools to detect. In most cases, the driver and software problems can be solved first.

When you encounter the "DefaultGatewayisNotAvailable" prompt, it means that the computer cannot connect to the router or does not obtain the network address correctly. 1. First, restart the router and computer, wait for the router to fully start before trying to connect; 2. Check whether the IP address is set to automatically obtain, enter the network attribute to ensure that "Automatically obtain IP address" and "Automatically obtain DNS server address" are selected; 3. Run ipconfig/release and ipconfig/renew through the command prompt to release and re-acquire the IP address, and execute the netsh command to reset the network components if necessary; 4. Check the wireless network card driver, update or reinstall the driver to ensure that it works normally.

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When the boot prompt is "Windows could not start because of the following fileismissing" 1. You can run bootrec/fixmb, bootrec/fixboot, bootrec/rebuildbcd through the Windows installation media; 2. Check the hard disk connection or use CrystalDiskInfo to detect the health status of the hard disk; 3. If there is a dual system, you can use the bootrec command to rebuild the boot or manually add the boot items; 4. Use PE environment to kill viruses and combine DISM and SFC tools to repair the system files, and the system can be restored in most cases.

If the second monitor is not recognized by Windows, first check whether the cable and interface are normal, try to replace the HDMI, DP or VGA cable, confirm the plug-in video output port, and test different interfaces to eliminate compatibility issues; then verify the monitor power and input source settings, and connect the monitor separately to test whether it can be recognized; then enter the Windows display settings and click the "Detection" button, or use Win P to switch the display mode, and update the graphics card driver at the same time; finally check the graphics card specifications to confirm whether it supports multi-screen output to avoid exceeding its maximum output capability.

Most Windows keys do not work are setup or system issues. 1. Check whether the "Use Windows Key Hotkey" function is enabled and turn off the relevant software or services. 2. Run Windows built-in keyboard troubleshooting detection questions. 3. Check whether there is a ScancodeMap key in the registry, and delete it to restore the Win key if so. 4. Update or reinstall the keyboard driver, try uninstalling the device and restarting it automatically. 5. Test hardware problems, change the external keyboard or use the test website to determine whether it is damaged. Most cases can be solved through the above steps.