Dont slate me If I have read the post wrong, but am i correct in assuming the following
You want to stream data from your PC e.g Music, movies Pictures ( Not games ) so that you can veiw over the lan via your Xbox to the PC ??
If I have got this right, you want to be using a program called Relax ( Currently V.06)
It runs on your PC as a service,
You state what files you want to share eg, MP3, AVI, DIVx etc etc
You then use XBMP to browse your shares from your PC then view Full Screen Movies over your Lan onto your Xbox With no lag what so ever etfc etc
Works for most media files out there.
I use it and it works a treat !!!!
Makes the Xbox a TRUE Home Entertainment System
Sorry If I have got this wrong anyone ( Don`t meen to offend !!! )