Then it's FT232 Chinese copy, doesn't matter no problem at all, most manufacturers use the cheap chips, as manufacturer I would do same 
You can try to reinstall the driver: download from FTDI website the FT2.. drivers, older versions are included too.
Maybe this will help.
Do you know how to install a driver manualy?
FT2.. drivers
Or see the help link: Tutorial on setting up and installing the FT232 driver