IIRC the FTDI chips use a non-standard com driver on Win 7. IF you want your device (with your VID and PID) to show up as a serial port, you need to associate

IIRC the FTDI chips use a non-standard com driver on Win 7. IF you want your device (with your VID and PID) to show up as a serial port, you need to associate your device with the usbserial driver, which at the very least requires a custom .inf.