1.) Do you install Garmin Usb drivers as administrator?
2.) Do you run updater.exe as administrator?
3.) Do yo drag/drop rgn on updater.exe like Caty say?
4.) Do you try with different cable connect nuvi to PC
5.) Do you work on laptop or home pc?
6.) do you try on some Pc with xp?
7.) what OS do you have on Pc?
8.) do you turn off UAC?