I'm having a similar problem with my GPS unit. I have an eTrex Legend (the one with the clear blue case, I know, I really should upgrade, but they take abuse so well) and I need to upgrade the firmware to take care of the WAAS bug problem. I downloaded the Garmin USB driver package and started it up. I got to the point where you turn on the unit, then plug it in and wait for windows to see it. The "New Hardware Wizard" popped up and Garmin tells you to just make it proceed with the "automatic" search and install option. But then, for me, that option doesn't work. Windows just tells me that it couldn't install the device, and the Garmin package tells me it couldn't complete. I have the unit on and the data exchange setup to "GARMIN" like the instructions say. No dice. Any ideas?