FTDI provide a utility called “FTCLEAN” that forcibly removes drivers from your computer.  WARNING: THIS WILL BREAK ALL DEVICES THAT USE FTDI DRIVERS, NOT JUST MOATES HARDWARE. Do not attempt this procedure unless reloading the drivers has failed to restore your devices to full functionality.  You should not be thinking about doing this unless you have followed all the steps in USB Troubleshooting 101 and USB Driver Installation.  Again, this is a procedure to save as a LAST RESORT.  WARNING WARNING WARNING!

With that out of the way, you’re looking at this page because your USB drivers are very broken.  You have devices in Device Manager with yellow exclamation marks that cannot load, cannot start or just plain don’t work.  This procedure will forcibly remove everything FTDI related and allow you to start over with a clean slate.

1. Step one: download FTCLEAN from FTDI’s website – link
2. Step two: unzip the file into a directory on your computer.
3. Step three: run FTCLEAN.EXE
4. Step four: click “Clean system” then click Yes to confirm
5. Step five: REINSTALL FTDI DRIVERS!!!  You should be starting from scratch.