I installed VirtualBox 3.1.0 and my wireless interfaces disappeared. How do I get them back?

I installed VirtualBox 3.1.0 and my wireless interfaces disappeared. How do I get them back?

I'm running VirtualBox 3.1.0 on a Windows XP host with an Ubuntu guest. I have a Lenovo T60 laptop which uses an Intel Pro/1000 PL network card. My wireless interfaces disappeared. They don't even show up in Device Manager.