well I am another disappointed Garmin user. just bought a 3598 and managed to install garmin express (several times!) and then 'register my device' and spent 4 hours getting nowhere. just going round in circles on the website.
tried every usb port, shutting down and restarting, updating everything, cleaning the system and hard drive.....NOTHING just a spinning pattern and no device attached!
when I rang customer support they told me they do not support Explorer or Safari running on a PC.
so tried BOTH chrome and firefox and NOTHING.
Even the phone link is no good because I have an IPhone and that is not supported
Installed every bit of additional driver and software I could find on the garmin website with just rising frustration.......
feel like taking the thing back and never hearing the name Garmin again.
looking on the net, this software is s big issue, and I dont like being taken for a ride which is why I did not buy another TOMTOM.