Network adapter priority in Vista

If you have multiple network cards in your Vista machine it is recommended to configure the wired domain network card as the first in the list.

On the Advanced menu, on Advanced settings, you can change the order which Vista uses different adapters.

To access the Advanced Settings, go to the Network and Sharing center, click Manage Network Connections - 5th down under task on the on the left then press ALT to make the menu appear.

Information and link to: http://blogs.technet.com/jamesone/archive/2007/04/03/network-adapter-priority-in-vista.aspx