Originally Posted by bonzoe

It is similar to XP
Control panel - Network connections - Local area connection - Internet Protocol V4 - Properties - select "Use the following DNS server address" and Enter the IP of your Router.

To be on safe side, repaet for IP V6.

The above applies to a wired connection, but I expect that wireless will be similar.

I have checked the above link which I gave and the procedure is basically the same, certainly enough info there to set up DNS on Vista I would have thought.