help

i purchased a linksys wireless-N home router for the use of my xbox 360. I set up my router and it works on my computer, but it wont work on my xbox 360 for some reason its says the network is not connected. it says i can choose it sometimes, but somtimes its not even there to choose, it has green bars when its there, but when it says test xbox live connection its goes to the second step and says network not connected. please help me its pissing me off

link to it Future Shop: Computer Add-Ons: Networking: Linksys Wireless-N Home Broadband Router (WRT150N-CA)