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Originally Posted by Big Mike
...when we unplug my dads computer from the router and connect it directly to the DSL modem, and his computer will work fine...
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You don't need a new router. If it works fine with the router out of the picture, it can be a setting in the router, or in the computer, but if all three computers have the problem the router is the first place to go, since it is the one thing common to all three machines. Go to Netgear's web site and check that the issue isn't covered there, or ask them for help.
When a router fails, it acts a lot like a brick that is sleeping.
From the modem's point of view, the router needs to look just like one of the computers. That means MAC address cloning. The router should be set to get an IP address automatically (DHCP). The modem should be set up exactly the same as when the computer is connected directly - make no changes because of the router.
(Trust me on this. I spent a week arguing with Verizon, having similar issues. I could connect to Google, but not USPS.com (the post office). The info above is what fixed it, given to me by Linksys Tech Support.)
It can also be a firewall issue, but less likely. Disable the XP firewall/McAfee/Norton/Zone Alarm/whatever on one machine for testing. If that fixes it, re-enable stuff a little at a time (start with anti-virus!) to see what's breaking it.
Those are the obvious issues. Again, contact Netgear, they can surely help you dig further.
good luck,
Don