I have windows 7 pro, suddenly restarted with this problem. I tried to repair the windows using recovery DVD, but still not booting after F8 and booting from DVD driver.
none of starting up options work save mode, or repair mode
when it is staring up, it gives a blue screen with error message stop: c000021a fatal system error
the verification of a knowndll failed. system process terminated unexpectedly with a status of 0x007e6c20 0x0000000
the system has been shut down
Please anyone can help me with this, I do not want to format the windows
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