Ok folks here's the problem, the daughter went for the w10 upgrade from w8.1 on her 6 month old laptop. It installed fine but the hdmi would not show the screen on her tv ( most likely a driver problem ). As she uses her pc to watch dl'ed movies this created a problem, she called me and I told her to revert back to w8 (which we are supposed to be able to do according to micro$oft ).When it reverted back it screwed up her password and now she can't get into windows at all. She lives 300 miles away so I can't try to hack into the os for her . Any one run into this ?