You forgot to include what software your using to play the DVD. Maybe a bad codec, or something hoging the system resources. Worst case it's the burner. Did you buy it new or used/off of someone?
Any scratches on the disc?
On a side note it would be best to buy a seperate DVD drive that is specifically used for ripping/watching DVD's as using your DVD burner for both ripping,watching, and burning will kill it's life span....