Quote Originally Posted by winger9 View Post
I have also installed this DVD onto my hard drive, and it shows up as distro
7.0.2, kernel release 3.3.7.

It works fine on the hard drive.
This leads me to suspect bit rot on the DVD or read problems with the DVD drive. Still, I would boot the DVD with the memtest option and run Memtest86 for a while also. If you have the original ISO file then I would also try burning anther DVD but be very sure to test the DVD after burning it to help confirm that you are not getting reading errors, although that isn't a perfect test against intermittent read errors..