I've received this error when trying to install Windows 7 64-bit on my Macbook Pro. The keyboard function seems to be completely disabled and I cannot make any selections or navigate away from this screen. I've read some forum post with regards to this problem but didn't find the answer I needed. I'm simply looking for a way to exit out of this screen and return to my normal OSX. I can't eject the disk or do anything because my keyboard isn't working. I simply want to abort the instalation but can't figure out how. This may sound like a really simple problem to you guys but I'm new to macs and not all that computer literate so I need some help. Thanks in advance for your help.