Hey,
I had the very same problem. I couldn't get around it, in the end I got a hold of an external USB drive and installed that way. The only change I needed to make was the vga=775.
I would spend you're time trying to get an external cd drive than fixing this issue, i had no luck and spent days.
If you do happen to fix this issue - please tell us how.
Regards,
zoidberg


