Hi Uwe,
In the service dialog (after pressing service), have you tried to click on the “Start” button? If so, does the service start? Depending on the state of the service, you may need to “Register” the service first, and then click on “Start”. You will not be able to load the GPIO600 driver until the service is running.
If after trying the above you are still unable to get it to work, please let us know what version of Windows you are running this on.
Thanks,
Pat
