The Changer Bus Enumerator is a device driver in Windows that facilitates communication between the operating system and hardware devices connected via the SCSI (Small Computer System Interface) bus, specifically for tape drives or autoloader devices that can be classified as "changer" devices.

This driver is responsible for enabling the OS to detect and manage robotic tape libraries, autoloaders, and other devices that provide automated media handling (e.g., loading and unloading tapes). The Changer Bus Enumerator is not something you typically install manually, as it is a part of the standard Windows operating system and should be automatically installed when a compatible device is connected.