Right click on My Network Places, and go to Properties. It should show both adapters in there. Right click on the adapter to enable/disable.

>How?
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>>>When I use my laptop in my home office, it still connects via the wireless NIC. How can I tell the laptop to
>>>connect via cable instead? When I plug the cable in, it still appears to be connected via the wireless card.
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>>On my laptop at home, I have the wireless adapter enabled and wired adapter disabled normally. When I need to connect via wired, I flip both of them.