I second TPeterson's recomendation.
Also try ac3filter for the ac3 codec. Another great tool that helps is reclock. Both are great utilities. I suspect it is your Video card causing the problems, believe it or not, but high end video cards are for more than just games. I have a AMD 2600, and a Radeon 9700Pro, and using the elecard filters my proc is at 100% but with reclock plays perfectly.
Both reclock and ac3filter are free.
Also try ac3filter for the ac3 codec. Another great tool that helps is reclock. Both are great utilities. I suspect it is your Video card causing the problems, believe it or not, but high end video cards are for more than just games. I have a AMD 2600, and a Radeon 9700Pro, and using the elecard filters my proc is at 100% but with reclock plays perfectly.
Both reclock and ac3filter are free.















(With all due respect, of course.) There are lots of reasons to upgrade. Nobody is supporting Win2k. Heck, I doubt you can even get security patches on Windows Update for Win2k (I saw a note on Windows Update that they were discontinuing WU support for XP RTM even). So I hope your machine isn't connected to a network 