Slow warped audio when capturing screen in VirtualDub

[GildedSpaceHydra]

I'm trying to capture audio & video from a game with VirtualDub on an older system using Windows XP SP3 (32-bit), and the audio is very warped and slowed down. It's actually kinda surreal and funny, but unfortunately not actually useful for my intended purpose. Any ideas where I could be going wrong?

I'm in the process of installing VirtualDub on my Windows 7 machine to see if it handles the task any better.

Thanks for any sage advice!

EDIT:

I tried the same setup in Windows 7, but I've got no audio instead of garbled audio.