I've been in touch with nVidia regarding the inability to launch their Control Panel. They've asked me to try several fixes which haven't worked. They've now asked me to do a clean install of Windows 10 which I was thinking of doing anyway. I have a self build & upgraded my current Windows from 7 to 10 a few year ago. Can someone tell me which is the easiest way to do a clean install please & would I need an 'activation' key? Thanks