Please feel free to learn from my mistake.

I recently reconfigured my system after a catastrophic hard drive loss. After reinstalling Vegas, I found I was dropping almost as many frames as I was capturing. I thought it was the ATA 133 PCI Card I added when I switched to a large HD (card was necessary on KT7-A motherboard while running Win98). Reloaded the ATA drivers. No change.

So I moved the capture drive back to the on-board IDE controller. Oops! System won't boot! Switched boot drive to SCSI in BIOS. Now I can boot to the ATA 133 drive, but I'm still dropping ~ 30% of frames on the capture drive. Updated my firewire card drivers. Still no luck.

Then I remembered -> I hadn't reloaded the drivers for the motherboard (VIA 4-in-one PCI bridge).... BINGO! Three hours of capture since, not a single lost frame.

I built my system from scratch and should have known better.