connected to the internet but cannot browse.

Hi im having a trouble with the wireless connection. im using winxp

If im hard wired to the router, i can connect to the internet and I could also browse websites.

If im using the wireless connection, im able to connect to the internet but i cannot browse any page. it only happens once i use the wireless connection. im sure that it is connected coz i can use other internet application like the remote assistance.

Any help would be appreciated.