How to fix windows 8 activation fails - SearchforSolutionsOnline

Actually Windows 8 activated by online verification of key.But it fails for those who upgraded their OS from windows 7 to windows 8.

To solve this problem we use command line.To do this follow this steps
1.Open Run dialog box by holding Windows button and press R.
2.Type cmd in Run dialog box,it will command prompt.Then type these commands
slmgr.vbs /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
slmgr.vbs /ato
In the first command, the “XXXXX” characters means your Windows 8 product key. That’s it.

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