Originally Posted by archie7
Not sure which hardware you have but i encountered the same problem with the ATAVRUSBRF01 which has the AT90USB162 microcontroller..
How i fixed it was insert the hardware into your pc/lappy hold down reset and hardware buttons then release the reset button 1st then the hardware.
It should then ask you for the drivers which you can direct it to program files ->Atmel -> Flip 3.4.1 -> usb.
If it doesnt ask for the drivers right click on my computer -> properties and select device manager and you should see an item with an exclamation mark, right click uninstall then select Action from the menu and scan for hardware changes this should prompt you for the driver. If this still doesnt and still get the exclamation mark just right click that and select update driver and navigate to Flip 3.4.1 directory as above.
Once the driver is installed you should be able to open the usb connection.
Hope this helps..
Did you select the correct target device 1st and also you sure the file isnt read only?