If your current copies play well on the pc, then it is probably not a problem with Shrink. More likely incompatible media with your player.
We recommend Verbatim brand blank dvds around here, either +R or -R will work for most, but unless you know for certain that your dvd burner bitsets +R to DVDRom, I’d go with the Verbatim -R to use in a picky player. It would help us to know the dvd burner you have, and the exact media you are using now.
Nero 8 should come with Nero CD/DVD Speed. If not, it is a free download. Load one of your blanks in your dvd drive, open Nero CD/DVD Speed and click on the Disc Info tab to tell us the MID code (manufacturer id code) of the disk. Nero CD/DVD Speed will also tell us the exact model of burner you have, and the firmware you are currently using.