Resolve Windows 10 related issues for your HP computers or printers by HP Windows 10 Support Center
I have the OEM window 7 key of my computer(pre-installed) but it does not work for activation window 10 after clean installtion.
How do I get the window 7 for activation window 10?
Try this number at Microsoft:
Navigate to the activation department and explain your situation...
Having Win7 running the Update feature let you adquire Win10 (then save the win10key). In a clean Win10 installation you need the previous win10key.
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