Posted 03 July 2008 - 05:15 AM
If a driver is not digitally signed, it is just a driver that Microsoft has not checked out. A driver is software that helps communication with hardware. For example printing a document. the computer can't communicate with the printer unless there is a driver that can act as a translator.
An updated driver will in most cases provide better performance, more stability, enhanced security and so on. It is always good practice to update your drivers. The hard part is finding them.