I have an old hard drive i used for a computer about 2 years back. This hard drive has windows 7 installed on it. I built a new pc and wanted to use the hard drive, I do have a key for windows 7. I installed a bootable windows 7 home on a flash drive. When I start the computer up it came up with a page that said pick a profile or something of that sort, so I press enter on profile 1. After that it says "booting from dvd/flash drive" then starts that like windows 7 floating color loading thing, gives a quarter of a second blue screen then starts at "booting from dvd/flash drive" again. I have no idea what to do and would greatly appreciate some help. I don't have another computer to put the hard drive in to wipe it or anything either.