The Microsoft AC Adapter Windows driver is a system driver that enables your computer to properly communicate with the AC power adapter (the power brick or charger) used to provide power to your laptop or device when it is plugged in. While many systems automatically detect and manage the power supply without needing extra software, the Microsoft AC Adapter driver ensures that Windows recognizes the adapter and manages power settings properly.

In most cases, this driver is pre-installed with Windows, as it is part of the core system functionality. However, if there is an issue (such as a device not recognizing the AC adapter, charging problems, or battery issues), you may need to install, update, or reinstall the driver.