Problems syncing Smartphone without Serial port

Here's what I have:
Sony PC - without a serial port
IOGear USB PDA/Serial Adapter (GUC232A) to convert USB to Serial
Kyocera 6035 Smartphone (phone/PDA combo) with serial cradle

The connection is fine. What I'm guessing is going on is that the COM
ports are being assigned dynamically. I start the sync and then the
connection "drops" and I get a lost connection message on the phone.

I've talked with Sony and IOGear so far without any intelligent
suggestions. I need some help from someone who knows something!

Help?

Thanks,
Deb