Question
How can I repair corrupted system files to fix the c000021a error?
Asked by: USER8645
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66 Answers
Answer (66)
You can use the System File Checker (SFC) tool. Boot into Safe Mode with Command Prompt (repeatedly press F8 during startup). Then, type `sfc /scannow` and press Enter. This will scan and attempt to repair corrupted system files. If SFC fails, consider using the DISM tool: `DISM /Online /Cleanup-Image /RestoreHealth`.