Would I need to format my Hard Drive if I was reinstalling windows?

NotMLGStudios

Commendable
Jul 15, 2016
10
0
1,510
Hello, I am thinking of doing the windows 10 free upgrade from windows 8, primarily due to xbox games on windows, and was wondering if I was to do the update and the rollback period ended, would I be able to grab my original Win 8.1 disc and reinstall windows 8.1 without formatting my main drive? Or would I have to install it on to a seperate drive? Also are the rumors about Win 10 spyware true? Just want to make sure.