So I had win7 32 bit on my machine, then I installed the 64 bit version. I don't think the 32 bit install ever got removed, because after I upgraded to 10 it began taking me to the dual boot screen on startup. Now I can't delete the 20gb of windows 7 files off my ssd (it won't let me- says that "trusted installer" won't let me make make changes to these files). So windows forum, my objective here is to have win10 be the only OS on the machine, and I'd like to have it installed on my ssd ( (D in the photo). Thanks everyone!