Most likely it's a codec problem. Sound or/and video.
Most reliable way is to remove all Audio and codec's from your OS.... I never done it for Winxp... but in Win98 they were in the Multimedia icon, in Control Panel, on the Device Tab. Once in there they were listed under Audio Compression Codec and Video Compresstion Codec.
I would just highlight each one and push Remove. What should happen after that is Windows automaticly reloads them, when your not looking. Anyway doing that on Win98 fix that problem with me...way back when.
Your on your own.....though.