Someone must know how to do this - surely?! I have a "your windows 10 upgrade is ready to install" window which I can't close. The only options are "start upgrade now" or "schedule it for later" - and if I choose to schedule for later, it offers me three possible dates of which I must pick one, and it warns me this can't be changed later. I DO NOT WANT WINDOWS 10. Not now, not ever. Oh please, some wise computer person of Mumsnet, help me get rid of this infernal screen with no "close" option.