change a nero cd-image into a dvd image?

[psx_paul]

ok, for your scenario...

is your original un-readable, does the PS2 read it? does your dvd-rom read it?
try using bit of cleaning polish on the disc, mr sheen works fine for me, gently rub the polish in an outwards direction on the disc. then try reading it again.
if the above doesn't work, your best bet would be to go to your local rental store, hire the game out, and create your backup copy from that, keeping hold of your original obviously.

supposidly there is a way to take cd image and put onto dvd-r, cant tell you exactly how to do this buecause not found out yet myself.

hope this helps