Resolving stop (blue screen) errors in Windows 7 - Microsoft Support. Windows 7. Stop errors (also sometimes called blue screen or black screen errors) can occur if a serious problem causes Windows 7 to shut down or restart unexpectedly.

Describes how to use the System File Checker tool to troubleshoot missing or corrupted system files in Windows 8.1, Windows 8, Windows 7 or Windows Vista.

Blue Screen errors (also sometimes called black screen errors or STOP code errors) can occur if a serious problem causes Windows to shut down or restart unexpectedly. You might see a message that says, "Windows has been shut down to prevent damage to your computer" or a similar message.

Windows 7 Disk Check. Sometimes, your computer is noticeably slower or programs "hang" when you access certain files. This problem might occur because there are errors on your hard disk drive. You can troubleshoot the problem by using the Disk Check tool in Windows 7.

If you get an error code while downloading and installing Windows updates, the Update Troubleshooter can help resolve the problem. Select Start > Settings > Update & Security > Troubleshoot > Additional troubleshooters. Next, under Get up and running, select Windows Update > Run the troubleshooter.

If you see Windows Update error 80070020, another program might be interfering with Windows Update. Restart your computer and run Windows Update again.