If some Windows functions aren't working or Windows crashes, use the System File Checker to scan Windows and restore your files. Though the steps below might look complicated at first glance, just follow them in order, step-by-step, and we’ll try to get you back on track. Run the System File Checker tool (SFC.exe)

Windows 10. If you have multiple displays connected to your PC or if your display configuration changes, some desktop apps might appear blurry. Windows 10 (version 1803 or later) can try to fix this automatically, so apps don’t appear blurry.

You can repair some apps and programs if they're not running correctly. Note that you won't see repair, change, or modify options for all apps and programs. Repair options from the Settings page. Select Start > Settings > Apps > Apps & features. Apps & features in Settings.

To turn high contrast mode on or off from the sign-in screen, select the Ease of access button in the lower-right corner, then turn on the toggle under High Contrast. To turn high contrast on or off from the keyboard, press left Alt + left Shift Print Screen.

The Program Install and Uninstall troubleshooter helps you automatically repair issues when you're blocked from installing or removing programs. It also fixes corrupted registry keys. First, you'll need to download the troubleshooter. Download troubleshooter.

System File Checker is a utility in Windows that checks for problems with files on your computer. To run it, follow these steps: Make sure you've installed the latest updates for Windows, and then restart your machine. To find out more, read Update Windows.

Upgrade to the latest Windows version : Windows version 1803 introduced a new feature that can fix blurry apps on your primary monitor (you will need to restart the app after connecting or disconnecting a monitor). See Fix apps that appear blurry in Windows 10 for more details on how to enable this feature.

Under Sharpen/Soften, click the thumbnail that you want. Thumbnails on the left show more softness, and more sharpness on the right. Under Brightness/Contrast, click the thumbnail that you want. Thumbnails on the left show less brightness, and are brighter on the right.

The Microsoft Defender Offline scan will automatically detect and remove or quarantine malware. Learn how to remove malware from your PC. Use Microsoft Defender Antivirus in Windows 10 or Windows 11 to scan your PC for malware, viruses, or other threats.

Select Start > Settings > Update & Security > Troubleshoot > Additional troubleshooters, or select the Find troubleshooters shortcut at the end of this topic, and then select Additional troubleshooters. Select the type of troubleshooting you want to do, then select Run the troubleshooter.