Help with bizzare problem with WRT54G router

I have a WRT54G v2.2 router connected to 1 PC running Linux and a laptop running Windows XP which are both connected via Ethernet cable. The router is connected to a Netgear ADSL modem.
The issue which has occurred only recently is that the laptop has been blocked from accessing all sites except www.ninemsn.com.au.
The other PC can access all sites without issue.
I have tried restoring factory defaults, hard reset (using reset button and power down sequence) and updating to the current firmware. Nothing seems to unblock web access for the laptop.
I have connected the laptop to the ADSL modem directly and confirmed I can access any site. I have tried also booting to a Linux demo CD on the laptop, and this has had the exact same symptoms, which rules out the OS.
Running a netstat -a after opening a browser window to google.com.au shows an active connection, but the browser waits indefinatly for a reply. 
 Tried swapping the 2 ports around and also the Lan cable to no effect. Tried enabling the wireless adapter on the laptop and connect via wireless, but had the same symptoms. 
I am at a complete loss as to why this has suddenly occured. The same configuration has been running fine for about 2 years.
Any suggestions?
Message Edited by dean70 on 11-11-2008 06:36 PM

Enable DMZ on your router...To enable DMZ follow the link The link shows how to enable DMZ on wrv54g but you can still follow the link.

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