The sound on inserting comes from the OS.
But if the synsoacc.dll is missing, the eLC won’t see it.
In consequence no license can be found and Dorico not started.
Because of the missing dll I strongly suggest to reinstall the eLC.
If you’ve moved your license to your USB-eLicenser, then to run Dorico on your other computer, you simply install the USB-eLicenser into that computer when you want to run the software there.
It really does sound as if you need to reinstall eLicenser Control Center on the computer on which you’re having problems. You can download the latest version for Windows here.