Recording M&B videos on Vista64

Has any one done this or know how?  I have tried Game Cam, Xfire, and WeGame.  I can't get any of them to work.  All three of them support Vista but say there are some issues with 64bit Vista.

Hopefully an opensource program or one that offers a free trial as i don't want to spend money on fraps or something similar.

EDIT: I just tried Fraps and that will record on Vista64, but i will have to purchase if I want to record more than 30 second. 

so, i didn't get any answers and didn't have any luck on my own trying to find a free recorder that worked in Vista64 so I went ahead and spent the $30 on Fraps

Thanks LukeS.  I'm looking forward to what you cook up.