Installation Issue 3

Superb small module that if it worked would make a hit.
However on Windows 8, the module is recognized, but inaccessible from a ammplication answer all applications "Port always open ', more pid is 0 !!
Under Windows XP, is detected but does not recognize any driver FTDI, PID = 0 again.
I contacted the seller, but the problem is not yet solved! !
If someone has an idea, thank you.
I ordered 5 and 5 have the same concern, then. . . Too bad it would be if it worked so well.