Use the System File Checker tool to repair missing or corrupted system files. When critical Windows system files are missing or corrupted, some Windows features may stop working correctly or Windows may stop responding altogether.

To resolve the issue, use one of the following methods: Insert a removable disk in the removable drive before you start the computer. Log on to the computer as Administrator. Insert a disk in the removable drive. Click Start, right-click My Computer, and then click Manage. Click Disk Management.

Provides links to the uninstall tools and directions for many security programs.

Learn how to run System File Checker in Windows to check if your computer has problems with files.

Learn about Windows RE, how to access it, and the different tools it offers.

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 > Installed apps. Select the More icon next to the app you want to fix.

Use the System File Checker tool to repair missing or corrupted system files. When critical Windows system files are missing or corrupted, some Windows features may stop working correctly or Windows may stop responding altogether.

First, you'll need to download the troubleshooter. Download troubleshooter. If you see the File Download box when you start downloading, select Run or Open. The troubleshooter provides steps for you to follow. If a program isn't listed in the uninstall options, you'll be asked for that program's product code.

Learn about the recovery options in Windows. Find out how to reset your PC, go back to a previous version of Windows, or use media to reinstall Windows.

Troubleshoots and fixes common issues with security and malware prevention in Windows.