copy problems(please help me)

could u hlep me as i have just got my first cdr (acer 8x4x32) and i am having proplems copying dreamcast games i was useing nti cdr software and i have only managed to get one game to work after copying it and i tryed 2 other games that diddnt work they copyed all the info but diddnt work, and i wasted about 8 discs i also tried to do it with nero burner and that was unsuccessful.

thanks