How do I repair a Windows 7 installation damaged by Windows 8 sleep mode

Posted by Mat on Super User See other posts from Super User or by Mat
Published on 2012-10-25T09:18:50Z Indexed on 2012/10/25 11:04 UTC
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windows-7

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windows-8

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sleep

I'm experimenting with a Windows 8 installation which is on a separate SSD. My actual Windows 7 installation I'm working with is on my old HDD.

While Windows 8 was in sleep mode I swapped the hard disks and put in the Windows 7 HDD (I thought the computer was off). When I started the computer, Windows 8 started back up to the login screen – then it was stuck and some seconds later the computer rebooted.

Now the Windows 7 Installation is damaged. When I boot, after the Windows 7 startup logo appears, a bluescreen shows up for few seconds stating:

STOP: c000021a {Fatal System Error}
The verification of KnownDLL failed. System process terminated unexpectedly with a status of 0xc000012f (0x00f0bb90 0x00000000).
The system has been shut down.

and then the computer reboots. The same happens in safe mode. 'Windows startup repair' cannot repair the issue.

Any idea what could have happened exactly and/or how to repair this Windows 7 Installation?

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