Games thread!

I need a little help from anyone who owns an xbox 360 and uses live through a network (either wireless or wired). If you can PM me I would appreciate it.

Basically what I am trying to do is this:

I have two PC's, one desktop and one laptop. The laptop is on my wireless network and was connected to my xbox 360. However, because I kept downloading stuff onto my laptop HDD it was taking up a lot of space and so I'd like to actually connect my desktop (which has it's own HDD as well as an External attached to it) so I can use that to stream my music, movies, pics, etc. to my xbox.

The problem: My xbox only picks up my laptop through the wireless network and not my desktop. I have a cable modem connected to a linksys wireless router. The router is wired to the desktop through the port and the laptop just picks it up wirelessly. I am no good with computer networking and am looking for some help or advice on how to set this up.

My desktop is in a completely different room than my xbox which is in the living room with my big tv and surround so I can't just connect the desktop to the xbox through a wired connection (it would require too much wire and be a mess, plus I live in a condo and that's no an option to have a wire exposed).

I hope that made sense. If it didn't please let me know. Thanks for any help anyone has.