Driver install on Windows
If you are using newer version of dfu-programmer you have to install WinUSB driver, instead. Check this page.
You have to install dfu-programmer 0.7.2 or Atmel FLIP, frist. Those packages include virtually identical driver you can use the flash tools either without replacing driver.
You need to start bootloader and find it in Device Manager before intall driver.
With TMK products you can plug in your device and press button on it to start bootloader. But it depends on device in fact you may need to consult with supplier or manual of your device.
Right click on Widnows start button and select 'Device Manager' from popup menu. Or press Windows+R and type devmgmt.msc.
Before install you can find your device under 'Other Devices'.
After install it will be located under 'LibUSB-Win32 Devices' or
under 'Atmel USB Devices'.
Try to reinstall driver first, you may have to uninstall driver first. Also see http://imgur.com/a/bnwzy .
You will see an entry like picture below, in this case its name is ATmega32U2 DFU.
Right click on the entry and select 'Update Driver Software…'.
Select 'Browse my computer for driver software' here.
Select the folder of dfu-programmer you unzipped
or installed folder of Atmel FLIP.
Then install.
Installed.
Now device is ready for programming.
