laptop wireless internet not working

Why won’t the wireless internet at my house work on my laptop?
The internet works multiple other places except my house. There are two other computers in my house which the wireless works on. My laptop says it is connected and it has full bars but if you try to do anything nothing will load. I tried repairing the ip address and it says it cannot be done at this time. Whats going on? and how do I fix it.
I have the network key for my house.
This may be stupid, but you have a router correct. I ask this to assure that you are not on a peer-to-peer network.
Are the desktops connected wireless-ly?
Xbox 360 using laptop for internet (laptop wifi adapter)







