Network PC has lost connection to internet but not the network

I've just setup a new Windows 7 Pro PC on our work network, and it has lost its internet connection completely, although it can see the rest of the network. I'm using DHCP -the network and sharing centre shows a connection form the PC to the network but a  between the network and internet. All other Win7 PCs are Ok. When I click on Diagnose it says ' A problem is preventing the troubleshooter from starting' The detail says "an error occurred while troubleshooting c:\windows\diagnostics\system\networking\.  Error code:Ox800B01DE.
I've tried - turning off IPv6 , doing a system restore back two days, rebooting, removing the network cable so it redetects the Ip.
Any ideas?
alanterrillAsked:
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alanterrillConnect With a Mentor Author Commented:
Right, I've sorted it now. The very last program I installed was Adode CS3 studio. After a reboot the internet stopped working again. I uninstalled Adobe and the internet returned. So I read up on CS3 and although its compatible with Windows 7, it automatically installs Bonjour, which is the bit that causes the problem. Bonjour doesn't show up in MSconfig but can be seen running in Task manager as a process called mDNSResponder.exe. Stopping the process is not enough, it has to be removed altogether. Heres how:
From a command prompt type "C:\Program Files\mDNSResponder.exe" -remove
Then go to c:\program files\Bonjour . Find the file mdnsNSP.dll and rename it to .old
Restart the computer and delete the folder c:\program files\bonjour
Now the internet works and so does Dreamweaver
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lee555J5Commented:
"removing the network cable so it redetects the Ip"
That's not the way that works.

Type ipconfig in a cmd tool. Do you see an IP address/subnet mask in the expected range? Is the default gateway correct? Can you ping the gateway? Can you ping other boxes? Can other boxes ping this one?

Lee
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alanterrillAuthor Commented:
I did that- it showed a correct IP and subnet and DNS but the default gateway showed twoa ddress -the top one was 0.0.0.0 and the bottom one the correct one. I tried putting a fixed address in and it then connected to the internet..
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lee555J5Commented:
Does the 0.0.0.0 gateway appear in the advanced network settings for this connection? Can you delete it?

Lee
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alanterrillAuthor Commented:
No there's nothing in the gateway filed in advanced settings. I've just tried filling that field in with the correct gateway IP and after a reboot IPCONFIG still shows 0.0.0.0 as the default gateway.
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lee555J5Commented:
Does this box have more than 1 network port? If so, is the cable in the correct one? Try swapping them.

It's been a few days, so let's refresh. In this network connection's properties, it is set to Obtain an IP address automatically. ipconfig shows 2 Default Gateways, with 0.0.0.0 on top; and the gateway section in advanced settings shows nothing. But, if you set the IP address, netmask, and gateway manually, everything works; and ipconfig shows your manually input settings correctly.
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alanterrillAuthor Commented:
Its only got one network port. Yes your summary is correct.
I've just spent the morning resetting the PC to its factory settings then reloading all the software and checking the network setting after each install. It now seems to be OK.
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alanterrillAuthor Commented:
It works
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