That's the one I generally use, too. Neither Vista 64 system plays AC3, however. I've run through 2-3 AC3 options, but still getting nothing successful.
I'm giving up on one of those computers. The Vista 64 install is going to be upgraded to Windows 7 64 within the next 72 hours here. It has 2-3 issues that I'm starting to think are OS related.
I still need to figure out the Vista/VirtualDub/AC3 issue, however. The other system is locked at Vista64, because of what it is and what it does. I'm not upgrading it, for fear of screwing up some important functions. But it encodes in VirtualDub less often, so not a critical issue.
Thanks for your input. I wish it was as easy as that.