I tried to Activate window with accurate product key but, when I do error code xC004F074 is keep showing up.
I also tried slui 3 and slmgr -ipk in CMD but it wasn't working at all.
It's hard to getting support using phone for me so please help me by online support.
Regarding current situation, I suggest we use following commands to remove product key for Windows on this computer, and re-add it:
slmgr.vbs –ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
If it doesn’t work, Please try slui 4 to activate Windows 8 via Phone.
In addition, the issue might be with corrupt system files. Run an SFC scan.
Open command prompt(with admin rights).
Type sfc /scannow
Try activating, once the scan is complete. If the scan produced errors, this might be a problem with corrupted system files that needs to be taken care of.
If we still fail to activate Windows 8, please contact WGA to check your product key considering the security issue:
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