Audio/Video devices not available in Preferences

Bug description

I've used several other XMPP clients on this machine and each recognized sound card (IDT high definition audio Codec) and webcam (Dell Latitude E6410 integrated webcam), but not Gajim. The drop down boxes for sound and video are disabled.

Perhaps this is something that can be tweaked somewhere, then would you be able to provide guidance on what can be done for Gajim to discover that this laptop does have sound device and webcam?

Thank you!

Steps to reproduce

Install Gajim on Latitude E6410 laptop

Software versions

OS version: Windows 7 32 bit

GTK version: one that came with 0.15.4

PyGTK version: same as above