Sound Skips\Jumps when playing DVDs

I have a Dell Dimension XPS R350 and just upgraded (Clean install) to Windows
XP (Home). I previously had Windows ME loaded on this system and it played
DVDs with out any problems. After installing Windows XP and everything and
loading the system I decided to try to play a DVD. Now the Audio when
playing a DVD or DVD (.vob) files, skips the video picture plays smoothly but
the audio is jumping. This does not happen when playing a avi, mpg, mpeg, or
standard mp3 file only when playing .vob files either from a DVD itself or
from the hard drive. The original sound card is built into the motherboard
and has a Crystal Chipset, I even disabled the crystal audio and inserted a
Sound Blaster 16 card with no improvement. This occures with various DVD
playing programs, MS Media player, Nero Showtime and others. I have swapped
out cables, drives and even CPUs (same speed and specs), with out any
difference. The only thing left to swap out is the Motherboard, totally
different CPU, and memory. This all started due to I installed a Lightscribe
DVD burner and found out that it does not support Windows ME so I installed
XP. Does anyone have any suggestions as to what could be the cause or the
resolution to this? Any suggestions are greatly appreciated.