I'm not an idiot when it comes to computers but this thing (Tomtom Go 630) is a mystery to me. Just bought it, turned it on and everything looked great. A restaurant in my town was in the wrong place on the TomTom so figured I better hook it up to my also new Windows 7 PC and install the software and get maps etc. The CD wouldn't install to Windows 7 properly so I told it to connect to the internet and download new version of Tomtom Home 2.7. I connected to the TomTom home page and was informed that I needed to purchase an update to the Canada/US my map on the TomTom so I did for 70Euros or something. When I tried to run/install my new maps I was told that my installed maps needed an update first so I downloaded whatever it asked. After a long time downloading I was told that I didn't have enough room on the TomTOM do run the install. I ran downtown and got a 4gb microsd card and adapter and put it in the tomtom. Problem solved or so I thought. The installation of what I think was my purchased map seemed to execute OK and I downloaded some additional voices and such. When I turn on the TOMTOM I get "no maps found" and nothing happens. Hook it up to the PC and try to "operate my device" and says same thing. Click on "add maps" "north America 2GB" is on my computer and it comes back and says I'm short -76mb or something. What's going on? Does this thing have any memory when new out of the box? Is the 4gb SD card to small?