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You are using internet connection with DHCP and your newly installed Windows Vista wont connect to the internet or specifically can't get IP address from your router or your ISP?

Its a bug from Windows Vista. Here is a quick fix for the bug.

Do the following from your Windows Vista desktop.

Hit "Win" + "R" on your keyboard or click "Start Menu" >> type "regedit" in "Start Search" and click "regedit".

Type "regedit", without quotes and hit "Enter". You'll see the following:

Locate and access the following key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{GUID}

Or follow the screenshots below.

Navigate to "HKEY_LOCAL_MACHINE".

Then "SYSTEM".

Then "CurrentControlSet".

Then "Services".

Then "Tcpip".

Then "Parameters".

Then "Interfaces".

Then "{GUID}".

You'll not find "{GUID}" in there.
You'll see some weird subkeys in there such as "{2F586773-58DF-4BD7-9B63-8880D86C9FC4}" or "{9CFD431C-915A-475F-8C5B-3E3B720CAECB}" or "{a7bdf3d2-6a85-11db-b5ae-806e6f6e6963}"

GUID stand for Globally Unique Identifier. In this case, its a unique identifier that corresponds to the network adapter on your machine. I still can't figure out what is the GUID for specific ethernet interface. This will be more frustating if you have more than one ethernet interface. Well, for me I just pick all of them and add the following to them.

Right click on the right part of the window. New >> DWORD (32-bit) Value.

Type "DhcpConnEnableBcastFlagToggle" without quotes and hit Enter. The key added to registry, notice the last key at screenshot below.

Click twice on the key that you've just created. You'll presented the following. Change the "Value data" to "1" and hit Enter.

The key has been updated with the new value, see data column for the new key.

If you not sure this is the correct GUID, don't worry just repeat the step from 'Then "{GUID}"' above till the end for all listed GUID.

Once done, close the registry. Restart your computer for this to take effect.

Good luck!