When I built my system about a year ago, I put windows 7 on it. No problems. About 4 months after I got windows 10. I put 7 on one ssd and 10 on another, haven't had any problems what so ever and when I started the computer,I had the choice of windows 7 or 10. Then a little over a week ago I downloaded a movie (so I thought) but turned out to be a virus. I reformatted the windows 7 ssd,got rid of the virus and this is where everything went south. After Loading up 7 again,windows 10 on the other ssd wouldn't load and 7 was having problems also. So,I disconnected the windows 10 ssd and had to reload windows 7 because it just wasn't acting right. Well everything was going fine until I decided to reformat the windows 10 ssd and reload 10. Things were going fine until I downloaded the video drivers (nvidia) and windows 10 crashed which for some reason also messed up windows 7 (Remember both os's are on 2 separate drives). So I got the bright idea to completely redo both drives from scratch. Both drives were reformatted and I loaded up windows 7, so good so far. I went a couple days with just 7 and got it back to where I wanted it. I've reformatted the other ssd,then disconnected the windows 7 ssd, I loaded up windows 10,got all the drivers loaded,no problem. Once again so I thought. The problem now is,in order for me to choose which os I want to use, I either just start the computer and it goes straight to 7 or I have to go into the bios to choose the ssd which has 10 and I have no idea how to fix that (both os's are working at this time). Any help would be appreciated.