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Delorme Topo USA v4.0 looking for com port

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This is in reference to my wife's Acer Aspire One, model ZG5 running WXP
This computer has Delorme's (2002) Topo USA installed. The program works, except for recognizing the GPS receiver. I believe it is a Garmin GM307 (The Garmin name doesn't show up anywhere, only a cryptic "GM307" on a label). On wife's Acer, this device is not recognized and XP can't find a driver for it. However, when I plug it into my desktop, W7 finds "Prolific USB-to-serial comm port" device and installs it.

Device manager on wife's computer shows "unrecognized USB device"

Is there any way to get this device to work on my wife's computer?

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