Streaming Video & WMP

Hi! Some time after I'd installed Windows Media Player 11, audio stopped working when watching a streaming video (like CNN Pipeline etc.). Some servers offer a RealPlayer stream as well and there's no problem watching that, but when the stream is in Windows Media Format, the WMP plugin in Firefox is used and I can watch it, but I can't hear anything. I downloaded&installed Windows Media Codecs from Microsoft.com and it didn't help. I uninstalled WMP11, but the previous version (WMP10) does the same.

When I copy the address of the video stream and open it in VLC Player (or WinAmp), it works fine, so there must be some problem with WMP.

Does anyone of you know what to do? Or is there any chance of changing WMP Plug-in in Firefox for a different one - i'd like to be able to watch streaming videos embedded in wep pages as before.