XP full/ partial crashes when playing DVD

[Smithj312612]

Here are my specs:
Windows XP professional
2GB ram
3.0 GHz P4 processor

using:
9500GT graphics card
onboard 5.1 audio on Nvidia Nforce 680i LT SLI motherboard.

The problem i am having is that when i try to play a DVD in any of my DVD playing programs (WMP11, VLC, AVSdvdplayer) either the system crashes or when using WMP11 there is a partial crash which can be fixed by ejecting the DVD (sometimes).
I use nvidia Pure video decoder and i have realktek HD sound installed.
The problem has never arisen before.

I figured out what is causing the problems but not sure how to fix it.
I uninstalled the realtek sound software and DVD's played fine (but obviously no sound)
Is there a solution that doesnt involve buying an audio card?

Also my windows error logs tell me there is a problem when paging error on the cdrom and an error (bad block) on IDEport0. Looking back over my months even viewer the cdrom error only appeared today.

[Danneh]

With the realtek driver uninstalled try searching on Microsoft update for updates and hopefully it will find a windows sound driver thar you can use