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So, you may have to take you rmachine into a computer repair shop, as you may have corrupted the Windows files.
If you interrupted the upgrade (meaning you pressed the power button, to try and reboot, or power on) then you may have correupted the windows files.
It can be very tricky for an unknowing person to know WHEN an upgrade has failed, or if enough time has passed that somethign has frozen.
I fear you may have jumped the gun, and concluded a failure prematurely, and now the files need to be reinstalled.
To fix this issue, you MUST boot from a disc, and scan the hard drive for issues.
The best way to do this, is with your OLD windows 7 (r windows 8) disc, and boot from the disc.
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