Installing Windows 7 on Mac. A required CD/DVD drive device driver is missing
Everyone seemed to think that re-burning the disk would fix the issue. It did for a lot of people. But I had a purchased copy that I didn't burn.

The fix for me was to let Windows boot up. You'll see the black screen with a progress bar where the windows installer starts up. Start tapping F8. You might have to hold Alt/Option while tapping. I tried both just to be sure the menu would pop up. Then select: Disable Driver Signature Enforcement.

Doing that let me continue through the installer.