If you give up on Nero then try this. Download Slysoft AnyDVD to remove encryption and then try DVDShrink, both are free progs, apart from that I cannot answer your problem. Your PC stats would be nice. You could also try uninstalling INCD in Nero prog.
Dell 4500 512 mb ram 2.0 ghz window xp 80 gb harddrive LITE-ON DVDRW SOHW-1693S D: CDRom0 Memorex DVD-R