A Wireless LAN PCI Adapter is a device that allows a computer to connect to a wireless local area network (Wi-Fi) through a PCI (Peripheral Component Interconnect) slot on the motherboard. The device itself could be a separate PCI card or part of a motherboard, providing Wi-Fi connectivity to a desktop or other system without built-in wireless capabilities.

To get your wireless adapter working, you typically need to install the appropriate Windows driver. The driver is software that allows Windows to communicate with the hardware of the adapter and manage wireless connections.