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Problem solved... I confused Parallels "Restore to Snapshot" with Windows 'revert to restore point', there being none of the former and one of the...
So, i took Microsoft's advice and went to upgrade Parallels. Seemed to be going OK until suddenly the screen went black... every once in a while...
You can thank your lucky stars :P I tried solving that same problem and completely blew out my Win8.1, all I have now is a black screen that...