From Deskthority wiki
Getting USB to work with Flip in Windows
- Go into the Device Manager
- Locate the ATmega32U4FUD with exclamation mark in front (no driver installed)
- Click on it and then choose “Browse my computer for driver”
- Navigate to C:\Program Files (x86)\Atmel\Flip 3.4.7\usb (the correct driver should be in that location)
- Click Apply
Change the above path as needed for differing versions of Flip or custom installs.