Internet Connectivity problem

  Bruk 15:23 12 Aug 2008

Hoping someone can help.
I have a netgear DG834G router which I have connected by ethernet cable to my desktop PC running WINXPSP2 pro and also have a wireless connection from my laptop running windows vista home basic and have had no problems with it.
I recently tried to add a wireless connection to another computer but this was unreliable. I tried a few things to resolve this but the upshot is I have now lost all connections!! I did upgrade the router from version 4.01.20 to 4.01.37 and have discovered that I can't find the old version on the netgear website so I can't revert back to it.
I eventually did a hard reset on the router but when I try to use the smart wizard to re establish my connection it says connection failed.
Negotiation = LCP is down
Authentication = CHAPS authentication failed.
I have checked I have entered the correct user name and password.
When I look at the network connections on the desktop I see one for Internet gateway and one for Local Area Connection. When I click on the properties of the gateway it says the internet connection is supplied from a shared computer and I am unable to change this. The ipconfig/all seems to look ok for the router connection.
The laptop also has 2 network connections - a local area connection and a wireless connection. I am able to connect to the router using the wireless connection (local only).
I tried disabling both connections and shut down laptop and then rebooted the desktop PC but this has not changed anything.
It seems to suggest that it cannot connect due to a shared internet connection but I can't seem to find how to get rid of this or I could be barking up the wrong tree?
Can anyone help?

  recap 19:41 12 Aug 2008

Have you checked the firewall setting haven't changed when you upgraded the Router?

  Bruk 21:53 12 Aug 2008

Thabks for the reply.
would this be the firewall settings on the router or the computers?

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