The Microsoft Hardware Wireless Mouse Driver is a software package that allows Windows to communicate effectively with your Microsoft wireless mouse, enabling full functionality such as custom button mapping and battery status monitoring. To install it, simply plug in your wireless mouse, and Windows should automatically detect and install the necessary driver. If it doesn't, you can download it from the official Microsoft website or via Windows Update. Alternatively, you can manually install it by going to Device Manager, right-clicking the mouse under "Mice and other pointing devices," and selecting Update Driver.