First off I don't really know if this is the right section to ask this question in but I took a guess and it brought me here. So I have a SSD that i use as a boot drive in my computer. When I was setting it up I installed windows 10 but then I realized I didn't have a windows 10 key but I had a windows 7 key so I was planning on going to windows 7 and getting the free upgrade to windows 10. So I installed windows 7 on the computer but somehow it did not complete or something because when I boot up it shows me 2 operating systems i could boot to Windows 10 and Windows Installation. If i press Windows installation it gives me an error message and does not boot but if I press windows 10 it boots fine. I decided to just go ahead and buy a windows 10 key so I have a full version now but whenever I boot it shows the 2 operating systems it can boot to and I don't want that I just want it to go straight to windows 10. So I don't know if there is a way I can set it up in BIOS so it doesn't give me that message or if there is a way to delete the windows 7 files so it doesn't even think that is an os to boot to.