Where to get latest FTDI drivers:
1. latest FTDI VCP drivers is here:
http://ftdichip.com/Drivers/VCP.htm
How to re-install FTDI drivers in case of any problems or conflicts with another boxes:
1. disconnect box from PC
2. uninstall FTDI drivers: C:\Windows\system32\ftdiunin.exe
3. reboot PC
4. connect box to PC and install FTDI drivers from Infintiy-Box package