You can only use a retail copy of Windows 7. Burning a Windows ISO to use is illegal 99% of the time. If it is a genuine copy, then you need to contact the support of the site you bought it from for help to make sure it's a bootable copy.
I beg to differ. I've installed many different versions of windows on my MBP and some of them have been the untouched isos and others not. Try using something other than disk utility to burn the disk, it hasn't always worked well for me.You can only use a retail copy of Windows 7. Burning a Windows ISO to use is illegal 99% of the time. If it is a genuine copy, then you need to contact the support of the site you bought it from for help to make sure it's a bootable copy.