Nokia pc suite do not recognise dku50 data cable

Question

The software that I purchased from market along with dku50 data cable get lost.. So I puchase next time only software (nokia Pc suite) but it does not detected the cable and in device manager of my computer a driver to convert USB to UART is missing that could not be found..
Next I downloaded nokia pc suite from nokia web site but my cable was not listed there..

nokia pc suite cannot detect my data cable dku-50