Streaming Video Won't Play in WMP 11 for XP Home Edition

Recently, I've begun having problems seeing video clips streamed over the 
Internet.   These are from sites which use WMP.   I get the audio but no 
video file at all.   Some of the sites involved are the Setanta Broadband 
Network, Channel 67 (Glasgow Celtic TV) and Tottenham Hotspur TV.  

Other streaming video--You Tube and Veoh, for instance--sites which don't 
use WMP (as far as i know) play properly, both audio and video, on my 
computer.   DVDs play properly in the drive.   This leads me to believe
the 
problem is with some setting in the software, not the video card or
driver.  
I have checked the HP website and there is nothing there to resolve the 
problem.

Can anyone suggest a solution?


I have tried reinstalling WMP 11 and downloading the codecs for WMP 9 for
XP 
and deactivating video acceleration but I still only get the audio for the

sites initially listed with no video.

The computer is a Compaq Presario V2402US Notebook PC with an InterVideo 
WinDVD Player.
-- 
W Flanagan