Anyone experience this same issue or possibly know where you obtain the drivers for these decks? Searching Sony's support page finds no mention of the HVR-M15U.

Kevin, Sounds like a Vista issue. The M15 is standard Sony firewire and should be recognized by any edit system that uses firewire in/out. There isn't a deck driver because firewire/1394 is an industry standard.

Are you uploading it to an NLE? If so which one?