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Activation error 0xC004C003 on HP Pavilion following upgrade to W10
Looks like a common problem. I used the upgrade to Windows 10 from Windows 8.1 which was activated. Now I cannot get my Windows activated as the server repeatedly blocks me. I have used the slmgr.vbs /ato command and each time it comes back the specified product key is blocked. Any ideas what to do next?