[Geekcop]

This won't help solve the issue, but I'm posting to let you know that this is VERY common w/ WMDC & Vista. I had the exact same isuue w/ WMDC, VIsta and my VZW 700WX for almost a year. It wasn't until about three weeks ago that I was successful in syncing my device to my Vista based laptop. I've had my Treo since end of Sept '07. I ended up installing a custom WM5 ROM and that was the ticket. The problem was evidently with the ROM that the Treo shipped with. This may well be what's plaguing you.