PC on Wireless network issue

My pc has a program called Orb (streaming Videos, Music, and Photos) used to be detected on my Xbox 360. now it doesnt show up at all. my PSP can connect to orb through mycast.orb.com but has a sever timeout. Im using an ethernet bridge (WGA54G Linksys) and also when i try to setup my pc to use the adapter through a setup file it doesnt detect it. but my internet work just fine though. Although it did seem to work if i adhoc the two connections(adhoc to my pc, but it broke)

Windows XP Media Center 2005
Dlink Xtreme-N

And also my pc doesnt work if i directly connect it to the router directly(used to)

So can anyone figure this out???

 

I really can't understand how you have plugged all.

Could you be more specific please?

PC ---> modem <---- PSP

when you say my internet work just fine though are talking about the same modem?

Try to describe it better for me please

 

my pc(orb) -w- Router --- Modem(Cable)
Xbox 360 -w- Mom's PC
PSP -w-

Thats my setup. the "-w-" means wireless. My mothers is wired into the router. also now if i plug in my 360 into the router my mother pc gets no internet. also my pc doesnt have internet unless i use that WGA54G Adapter/Bridge (unless i buy another wireless cardor usb.................

 

appearently i got it to work it was just a hardware issue i reinstalled the driver

nvidia nforce networking controller

My xbox now shows Orb and Zune Stream both are working.

i always do this i fix/figure the problem after i tell whats the problem i fell as if you are helpless on fixing my problems..............but you guys do a good job on malware and viruses though.............