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I have windows 10 that I reserved a copy and it checked and said this computer with win 7 sp1 was ok too win 10, I had to do
a clean install and didn't get a key when it was loaded. this computer had a problem.
Please repost your Windows 10 query to the appropriate WIndows 10 Community forum here...
http://answers.microsoft.com/en-us/windows/forum/windows_10-windows_install-winactivate