they are already installed
 

yes it plays well with others players. Ogg direct show filter v0.995 is installed as well as ogg codec v1.0.
It's written :"unknown file format" not "file not found".

bsplayer just doesn't want to play ogg format with or without video.
i can play any ogg file format or muxed with video with WMP. That's why i don't understand it can't be played with bsplayer.

Any others ideas? I hope so...
I'm very helpless as i love this player. I couldn't do without it.
If the trouble can't be solved i ought to go back to Windows XP but it would be the very last solution...

I know this will read weird but... sometimes changing the overlay mode solves this issue for me !