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ANT+ agent says device "not active"

I've spent the whole afternoon trying to get my brand new 910XT (on backorder for months, arrived today!) up and running.

I got stuck at getting the Garmin Ant Agent (V2.3.2) running on Vista Home Premium 32 bit. The agent continuously reports the USB stick as not active.

When I plug the USB stick into a USB port, I get a successful load of drivers for Ant2 stick. I've tried every USB port on my PC, all with the same result.

I always get the icon with a red line on the notification area of the task bar, and the agent reports "USB Ant (tm) stick: Not active"

This behavior has remained unchanged through many restarts, re-installs, and physical power downs of the PC..

I have another Ant stick that gave exactly the same behavior when I plugged it in. I use that with another program for bicycle training, so I know that stick works.

Any suggestions, short of re-installing my OS? I was super excited to finally get the 910XT today, but at this point I am at my wit's end to get the Ant agent to recognize the Ant stick...

I have a bunch of other Garmin software installed on my PC - the USB drivers I use with my FR305, as well as Garmin Connect to work with our car GPS. And of course the Garmin Connect plugin to upload data to Garmin Connect.