Internet connection wireless

i can use any other laptops on my wireless but the one that runs on XP.... it was working fine untill i conected it to my xbox (me being retarded) and now it says its connected to the wireless and the signal strength is EXCELLENT but when i go to browse (google chrome) it says error 105 (server not found). this is really pissing me off please help me :O.

Config XP - browser Google Chrome

P.S. i have tried turning off windows firewall, and someone said something about going to control panel and internet settings and tsp/ip or something and making the ie setting automatic, but i get all the way to the internet settings and can't find the tsp/ip setting.

all help apreciated, thanks a bunch! :D :D :D