Okay so i've tried searching for this problem. but basically what happens is that when i try to boot backtrack off my USB to install it, as soon as it starts loading with all the text scrolling up my screen gets all messed up and i can't view my screen (this is just as it is loading i don't even get to type "startx" before it messes up)! but i know that its still running in the background. had the same problem with ubuntu btw but because ubuntu has a fallback mode i was able to install the proprietary drivers and then i was able to boot it normally. but i don't see that fallback mode option here! how do i fix?!?

Thanks in advance for the kind and prompt response!