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#11
If you have taken the advice, endlessly offered, to use 3rd party disk imaging regularly and routinely you will already have a set of image files (e.g. full and differential) so you can restore your PC from many problem situations even if your system disk fails, your PC is unbootable, or even potentially to a new PC should your PC be stolen or destroyed.
Normally it's a safe procedure; any upgrade can fail of course. Failure usually results in an error message and leaves you back where you were.
I've posted 4 step simple instructions many many times here.