The 21A Fatal Error is associated with a corrupted system file on your computer. Corrupted system files can cause a lot of problems on your computer, including data loss. When this occurs, you will need to repair your system files immediately to stop any data loss on your computer. You can fix this problem by using the Windows File Checker. This free software package will scan your computer and replace the bad system file with the correct version.
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Click the "Start" button and then click "All Programs."
Click the "Accessories" tab and then right-click on "Command Prompt."
Choose the "Run as administrator" tab from the menu that appears and then enter your administrator password into the field that appears.
Type "sfc /scannow" into the Command Prompt and press the "Enter" key.
Wait for the scan to finish and then restart your computer.
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