Just to let you know, my old VGX-XL 202 capture card (original factory card) works flawlessly with VirtualDub on Windows XP, but crash with Windows 7...
As your card is quite good, and if you can (and want to) downgrade the O.S. to Windows XP, I'll give it a try... with the "ancient black magic" of analog video capture, sometimes it's the best way to go! (^^,)