Serious bootcamp issues

I tried using bootcamp to install windows 7 on my imac using an iso burned onto a disk, when attempting to install the "copying windows" percentage instantly shot up from 0 to 100 so i'm assuming it somehow couldn't access the files properly since on the "expanding files" step it got stuck at 0%. I tried doing the set up multiple times with and without the usb with the apple support software on it that bootcamp installed and still the same result. I tried booting up the computer without the set up disk multiple times but all i get is a blank command prompt in which i can't enter any commands. The windows iso i used worked perfect for parallels twice so i'm not sure what the issue is with installation. Currently im stuck in a sort of limbo state where i can't start up either windows or os x and i'm pretty worried that i just messed up my $2000 computer so any help you can offer will be massively appreciated.