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how to activate a windows 10 upgrade on a previous copy of Windows 7 E
I have a PC that had a copy of windows 7 Enterprise on it. I did the upgrade to windows 10, but am told it is not activated and it won't activate.
I need to know if I can buy an OEM version of windows 7 or 8 and activate using it's key, or if I can buy the full version of windows 10 which is for new installation, and use it to activate? I do NOT want to reinstall new since I have many programs I do not want to reinstall.
What is the best way to go abut activation?