Silhouette Studio, the software provided by Silhouette to drive your Silhouette cutting machine, does not require a driver. If a 'New Hardware Wizard' is shown when the Silhouette machine is connected and powered on, you can safely choose to ignore the wizard.
If you are looking for a driver to use an alternate program, please note that Silhouette does not have drivers for its machines. Silhouette does not restrict the use of other programs, but we also are not able to support operations outside of our company's provided and supported system.
Your understanding is appreciated!