I have a debian wheezy pc and i am trying to put windows 7 back on it. I managed to find a way to get an iso and i have a valid product key. I formatted the flashdrive(8gb) in NTFS and, using UNetBootin(A legitiment software used to put iso s onto flashdrives) put the iso on the flashdrive. I tried booting off of it and it gives me a dos-looking screen with a white blinking underscore but i cannot type and nothing is happening. What do i do?