I'm kicking myself now for upgrading to ruddy Windows 10 (on the very last day of the free "offer"). It didn't seem very different, so I was congratulating myself on not having any problems. But then... I have a 3 year Norton 360 anti-virus which has updated to accommodate it, and will keep updating until the 3 years expire. But I've just found out that the Norton Utilities 15 lifetime product that I got free with Norton anti-virus way back when is not compatible with Windows 10 and will not update. And of course you only have a month to change your mind and go back to Windows 8, and that's long gone. NU kept my computer ticking over nicely and it is noticeably slower now. Why, oh why, did I not leave well alone? 