Let me try a second attempt at writing this! I have an Oregon 450T (Software Version 5.9), running Basecamp 4.0.1 with Drivers 2.3.1 on Windows 7.
When in Basecamp and I plug in the Oregon, I get this error message: "An error occurred when attempting to use the TOPO U.S. 100K Map Product".
Now, I also have a netbook computer and got that same error message. I reinstalled the Drivers 2.3.1 set and it worked and the map opened up. However, reinstalling the drivers on my desktop is not working and I get the message everytime.
I've tried uninstalling and reinstalling Basecamp along with the drivers. I also tried deleting the .gpx files from the Oregon itself (since last year I had a similar error related to .gpx files).
Again, I'm just trying to get this to work in my desktop computer (works find on the netbook)...any suggestions would be welcomed! Thanks!