I think that FT2232H drivers are not well installed.
Yes you have found the files, same name but not sure that it is the same version.
Sometimes there is a mix of new files and old files from an anterior installation that disturb the system.
Could you try to uninstall you driver using the FTDI utility "CDM uninstaller"
(see the end of this post : http://www.vivadatv.org/viewtopic.php?f=80&t=379
and install again using run the CDM212xx_Setup.exe as administrator.