Thank you very much for your help voyager56!
I read about Garmin Lifetime Updater, but chose not to uninstall it and instead stopped its process and put it into Kaspersky's "jail" of untrusted apps. Maybe I should uninstall it, after all its easy to re-install. My USB cable is ok as the pc recognizes the Nuvi and offers to open windows explorer. As for the drivers, if the pc recognizes it, shouldn't it be installed already? I'll give your advice a try and uninstall GLU and check if I need to install any drivers for the GPS. I'll post my results...
Best regards!