With Windows 8.1 Enterprise preview, after getting a bad sector I went through Check Disk's fix error routine, and then tried to use Refresh. It tells me my disk is locked and needs to be unlocked. I know of no way to do this short of reformatting and reinstalling Windows. I have read "Cannot unlock drive and unable boot back into Windows 8" and didn't see an answer. Of course, maybe the answer is that there is no answer.
Thanks for any help.