If you are getting an error every time you try to format an USB drive, then follow nthe following instructions:
Right click on WBFS Manager icon
Click on "Compatibility" tab
Check the box "Run this program in compatibility mode for:"
Select "Windows XP"
Click, "Apply", then "OK"
Now you have to run the program as Administrator, to do so:
Right clikc on WBFS Manager icon,
Select "Run as Administrator"
Now you should be able to format the drive and transfer files to it. At least I could.
Hope this helps