Xbox live help!

hey,

i recently left on a vacation leaving and when i came back my uncle bought a new wireless modem. ( I can only use wireless for live) so i'm like okay, i try to connect to live and it says it cannot connect and i go troubleshoot and it says that my cables aren't connected. (its a linksys adapter but i have a new telus router) but i'm thinking it should work. I try reconnecting and it works it says cables are connected. and then it says some other crap. I go in the settings and go to advanced and then wireless. It says that it can't detect my wireless adapter! It says cable's conneted in the trouble shoot menu but not in the wireless menu. Wtf!!

help would be appreciated, thanks!