Por lo que he visto, aconsejan reinstalar drivers para ese error (el 10);
¿has instalado los drivers FTDI? Quítalos, no los necesita.
"The '8U2 firmware uses the standard USB COM drivers, and no external driver is needed. "
El error 19, mas o menos aconsejan lo mismo;
Error on the screen
Windows cannot start this hardware device because its configuration information (in the registry) is incomplete or damaged. To fix this problem you should uninstall and then reinstall the hardware device. (Code 19)
Aquí hay una lista de los errores;
http://msdn.microsoft.com/en-us/library/windows/desktop/ms681382(v=vs.85).aspx