T510 can connect to wireless but has no internet connectivity on working wifi's

Hi,
I have a T510 with an Intel agn wireless card.  On some wifi (always G), it finds the access point. It gets the proper information from the router (proper gateway, dns, ip), but no internet connectivity.  The router is working fine (checked by using other computers)
If you run the lower level intel diagnostic it fails on the ping.
If you look at the ipconfig, everything looks fine.
The sequence is attach to the access point (wep), it say internet connectivity for about 10 seconds then it says no internet access.
No Zone Alarm, No firewall running, No virus protection enabled.
thoughts?
The machine is 2 weeks old. 
thanks,
stevew

I have reset my airport this was the second time i was toying with it all last night. I was able to get on the little website for our modem so I disabled that firewall and turned off it's wireless capabilities and a few other odds and ends. And then I redid all of airport. Now though I get an unresolved problem status with "Double NAT" it says and I quote that "This base station has a private IP address on it's ethernet WAN port. It is connected to a divece or network that is using Network Address Translation (NAT) to provide private IP Addresses. You should change your base station from using DHCP and NAT to bridge mode." I ignored it because it seemed to be working last night fine with all of our devices on at the same time. but then again last time I reset it, it worked fine for about 3 days and then went to it's old habits.

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