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Microsoft has been aggressive in upgrading computers to Windows 10 - often without you realizing you did give them permission - you just didn't realize you did. So, if you, like many others, has just recently found you are now on Windows 10 and want to go back here's what you do.
NOTE - this only works for one month after the initial upgrade - so hurry if you want this to be relatively painless.
Here's the STEP BY STEP process - it should take you back to where you were