I have seen an issue in XP that deals with WinDVD and PowerDVD 4XP,, seems that in certain hardware configs the picture freezes,, sound chitters and its annoying!!!
In looking for a true fix over uninstalling one and installing the other, I found this!!
this is FREE,,and I too have the Matrix Reloaded recently *ahem* acquired and the Picture quality ,, playback and ease of use was awesome!!
It plays MPEG 1/2 , DivX, VCD, SVCD, DVD, OGG,,, you name it,,
best of all it also supports Server Side Streaming Video!!
I rate this little player 9.5 pints !!
check it out!