Help with Nero 4

The disk that i am copying is very lightly scratched, but I have tried to back up my children's games and the same thing happens but the read process will get to different stages, say 15% and on another game 11% and just hold and the drive is working. The other day I backed up the sims which is a pc game, I had no problem.
I was wondering as well if a game is slightly scratched would this affected the read, the problem is only with psx copying.

Ruskee.