My best advice to anyone not on 10 now .............WAIT!!! I upgraded to 10 a two wks ago today. It was fine, I liked it then my Start key would not function. Googled and found a fix, did what it said then did a restart and it worked. Yesterday my Start key wouldn't work again, restarted and all is fine. My friend on the other hand upgraded hers after hearing that I did and she's had nothing but problems. Her drop down window from doing a rt click won't stay open long enough to make a selection. She googled and found something to try which must have been a scam and it caused her computer to crash and not come back. I am loving Win 10 but think it would be very wise to have waited out the year to get my free copy.