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I've searched the internet for similar problems, but I couldn't find an answer. Thus, my question is:

After upgrading my windows 8 to 8.1, I am no longer able to boot windows from the GRUB menu. Ubuntu still functions fine. Whenever I select the option to boot windows, the screen goes to black.

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marked as duplicate by Alvar, user68186, Braiam, karel, Eric Carvalho Nov 29 '13 at 14:04

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
@user68186 sees to be the exact opposite instead, so it's not a duplicate. –  LiveWireBT Nov 29 '13 at 2:11
    
possible duplicate of Windows 8 wont boot after installation of 12.10 or also of Installed Ubuntu My Windows 8 Not Booting. –  karel Nov 29 '13 at 8:57

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