So your gateway, ie your router is 192.168.1.102 -- thats seems ODD... You sure you were not just pinging yourself?
Please post the output of your ipconfig /all
As to the MS article your reading about vista and issues with dhcp servers.http://support.microsoft.com/kb/928233
Its not guild its GUID
Locate and then click the following registry subkey:
In this registry path, click the (GUID) subkey that corresponds to the network adapter that is connected to the network.
A GUID, or "Globally Unique Identifier" is a unique number that windows creates for a particular almost anything like a network interface, application, user, etc.
You need to find the "subkey" that matches up with the interface your using to try and get a dhcp with. And then place that DWORD in there.
For example -- on this laptop under that key, this is the GUID for the interface that is being used. You need to search thru these GUIDs for the one your using for this connection.. It may not be the first one.. But you should be able to figure out which one is for the interface your using to connect.. One way to do that is to set a static IP for the interface, and then look for the GUID that shows that static IP set.
I would also suggest you disable IPv6 if your not actively using it.