Connected but can't ping router or surf!

I have 2 XP computers and one laptop. Using an SMC Barricade wireless router on ADSL. One PC connected to router by LAN cable, other PC wireless, both connected and on the internet. The laptop connects fine through LAN cable to router. WIrelessly I can connect to the router and see shared files on both computers, but can't surf! Also, it times out when I ping the router! I'm using DHCP. Have tried static IP and same problem. Also uninstalled and reinstalled the wireless network card. Any ideas? Thanks.

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