here is the lastest windows media player from microsoft, its only a beta but its works good
http://download.microsoft.com/download/e/e/e/eeeb2d1e-8000-4f23-b770-ddb34a9c8f45/wmp11-windowsxp-x86-enu.exe
There is also a post in the >> UPDATES << topic http://forum.avast.com/index.php?topic=9671.msg177062#msg177062 about the WMP 11 beta and here http://forum.avast.com/index.php?topic=19387.msg176855#msg176855