The PCI-Parallel Windows driver is a driver that allows your computer to communicate with a parallel port interface via a PCI expansion card. These types of cards are typically used when you want to add a parallel port (often used for older printers, scanners, or other parallel devices) to a modern computer that does not have a built-in parallel port.

The PCI (Peripheral Component Interconnect) expansion card is installed into your computer's motherboard and provides one or more parallel ports (DB-25 connectors) for connecting legacy devices. The PCI-Parallel Windows driver is required to make the card functional in a Windows environment, enabling the computer to communicate with and control devices that use parallel connections.