Been trying to update my UK MAPS for my GO 500 using my pc. I followed the instructions using MyDrive Connect after it's installed. But I keep getting the message of "Not Connected" when I connect using the std TomTom cable to my usb port (works with another device in my pc using same port), when told that my maps are ready to upload/update. Device works OK via the cigarette connector in my car. Help please... thanks.