Vista PC connects to Tour, but Access Manager can't detect it

I've managed to successfully get online with my Tour tethered to a Windows XP netbook using Access Manager.  However, I can't get it to work on a Vista-equipped laptop.  The Vista laptop connects to the Tour just fine, but Access Manager can't detect that the Tour is connected.


I've tried uninstalling and reinstalling Access Manager.  I also tried installing the latest version of the BlackBerry Desktop Manager.  Nothing seems to work.


Does anyone have other suggestions?  Thanks!