Everytime i try and backup one my dvd matrix revolutions it keeps stuffing up. During the decrypting stage it keeps saying I/O error then when i click retry it still doesnt work, and when i click ignore it says failed to read sector. This keeps happening heaps of times. Normally if it does it once i just click ignore then it doesnt happen again. What could be happening and can i get i program to prevent it. The current programs i use are dvd srink and dvd decrypter.