I'm trying to install Windows 7 on my MacBook Pro (13 inch Mid 2012) running OS X 10.7.5 I'm using a USB drive to create the boot disk, and I also downloaded the drivers needed from the apple website. After creating the partition and restarting, the system tells me that there is no bootable drive available. I try holding the option key and then selecting the windows partition and then it shows the same screen.
Any ideas of what's wrong?