Currently I'm on 10 and while it works properly it has some issues such as, if I make a new local account I'm unable to use it because.. I don't know (All I ever did was enable/disable some notifications and change the login screen's wallpaper). And secondly, if something odd happens to the computer I might get hit with Firefox bricking (i.e, unable to open at all). So despite these two issues I'd say that I do like the OS and the computer runs better with 10 than 7 but if these problems arise again it'd be really unpleasant, plus I'd have wasted my time upgrading/making a fresh install for nothing. For information about my computer (well, technically a notebook) Processor: Intel(R) Celeron(R) CPU N2740 @ 2.16GHz RAM: 2.00 GB Type of System: 32bit Operating System (Based on x64) P.S.: I have a bunch of Steam online games I wanted to play but because of this I can't because if I do I'll most definitely get Firefox bricked like it has already happened yesterday whilst playing Wild Warfare. P.P.S Could I use the "legit" key I have of Windows 10 or if I were to reinstall Windows 10 would I have to first go through 7 again?