Hi All can anyone help me with a minor niggle thats starting to get to me

.
Windows Media Player is buffering continuosly when embedded in web pages
(eg: http://www.drumandbasswise.co.uk/JoomlaRadio_v3/Stations/Radio1.php ).
if i copy the url to my standalone WMP11 it plays fine.
its not my modem or router because i have 2 other pc's set up to the router and they are fine. all pcs are xp pro, IE7, WMP11, AVG, Sygete personal firewall.
i have all the latest petches and updates and the latest flash players and sun java installed.
Hope somone can help thanx
Khz