I have a duo system on separate hd's, Win 10 on new SSD hd and Win 7 on a older Sata hd. I choose via the Bios on which I want to use for the day. Lately, when i choose Win 10, I see the revolving loading circle and the next thing I see, win 7 appearing. I cannot understand what is going on here. Is my new SSD at fault, the Bios screwed up or what? I did go through the Repair mode with my Microsoft tool program and it worked only for one day. The next time I tried to open Win 10 via Bios boot, after seeing the revolving circle loading a message appeared as follows: " We cannot complete update.....Undo changes....Don't turn off your computer", then it opens. Does anyone have any suggestions?