okay so about a week ago i installed Ubuntu for the second tI'me, first tI'me went fine but i needed more space and uninstalled it, properly so ever thing was good, that was when i was duel booting it with windows 7, since then i have upgraded to windows 8, i attempted to duel boot windows 8 and Ubuntu 12.04 lts(something like that) and everything went fine on the Ubuntu side, but now with windows 8 when i choose that i get the loading screen but then my screen goes black, i have no mouse cursor, i have left it on for a while before in case it just needed tI'me but still nothing, I'm pretty good with computers but this I'm stumped on, i even ask one of my ICT teachers in school, he recommended i just go back to windows 7, so i have decided to try with my boot-able USB, i tried to programs to i install the windows 7 on my USB, i haven no recovery disk(stupidly) and i have no system restore points, when windows 8 attempts automatic repair:( if my windows 8 is fixable please can you help me with that, if not can you help me just replace my windows 8 with windows 7?
By the way, please note that I'm doing all of this on Ubuntu just to say! please help me I'm so desperate!