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I had a nice setup with my desktop PC running Windows 8. It had been running fine since the first or second of this month - when I installed it.

But after attaching my laptop's HDD with a SATA cable and unplugging it again, I got a message to restart because of drive errors.

So, I restarted. Windows rebooted itself several times, and at the end, it produced a BSOD, complete with new sad face and a message: 0xc000021a. I've seen some methods online, but replacing DLLs? Seems risky to me.

Startup Repair (which started automatically) didn't fix the problem.

I can boot into Windows 7, however.

How would I fix this problem and get back my Windows 8 installation?

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    Your files are damaged, try sfc /scannow from the command prompt on the installation medium, if that doesn't help you'll need to do a reinstall... – Tamara Wijsman Mar 31 '12 at 0:14
  • @Tom Wijsman: I already tried that. It didn't work. – JavaAndCSharp Mar 31 '12 at 1:55
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    Uhm... You didn't try to reinstall or restore a back-up yet? There's not much you can do if your partition got corrupted due to drive errors. – Tamara Wijsman Mar 31 '12 at 2:10

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