Two simple solutions, and not necessarily in this order (but you could try both) :-
1. Turn off DMA for your DVD-rom, just use PIO.
2. Use a better ripper, such as SmartRipper 2.36
If you have a VIA chipset M/B, have you upped its All in one drivers to the new XP compliant one (cant remember its number, but just released).
Cheers,