Not able to install windows update on windows 8 pc... at restart stage it fails on 12%

[Yadav_ka_chhora]

I wanted to update my pc to windows 8.1 from windows 8


when I visited windows store and clicked on windows 8.1, it suggested me to first install windows updates on current system...


I checked for updates and downloaded and installed , but at restart stage the process stopped on 12%. then it attempted several times but couldn't complete


then it started reverting the changes and couldn't do it too


I had to reset my pc ...


what should I do

(my windows installer is on so tell me other solution)

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