The Initialize method throws a strange exception saying that the driver is not found. Why?

The exact exception message is the following: "A volume has been accessed for which a filesystem driver is required that has not yet been loaded".

This error is reported when the driver is not loaded or initialized. If you have just installed the drivers, you might need to restart the system. Otherwise, you can use GetDriverStatus and GetModuleVersion methods to check if the driver is installed and loaded. Additionally, please check that the values passed for the Install method's ProductGUID parameter and the Initialize method's ProductGUID parameter are the same.