sound driver is warped

TO whom ever can help... I am having difficulities
watching DVD's through windows media player as the
soundcard is warped and frames and volume skips on random
DVD's....I have windows xp it came with the computer.
When I went to the trouble-shooting program on my
computer it sugested getting a new sound driver?!? what
is that and will I have to pay for it ?

I am frustrated with this re-occuring problem please
help!!

-valued customer!!