Application crashes when the option for web interface is checked.
This is most likely a permissions-problem. Try running the app as administrator instead, it should work.
I'll make sure to fix this in the near future!
The problem persist in version 2.3.
I'm on Windows 7. I found a workarround to get the interface installed.
I run the FTPbox with windows XP SP3 compatibility mode enabled. Then in the options pannel I check to install the web interface and it work properly. After that I can disable the compatibility mode.