The Sony Memory Stick Controller (PCI) Windows driver is a software component that enables the use of a Sony Memory Stick on a computer via a PCI interface (typically, a PCI or PCIe card that provides a slot for inserting a Memory Stick). Memory Stick is a type of removable flash storage media developed by Sony, primarily used in their consumer electronics like digital cameras, smartphones, and gaming devices (such as the PlayStation Portable).

The Sony Memory Stick Controller driver is required for your Windows computer to recognize and communicate with a device that reads or writes data to a Memory Stick via a PCI-based reader or controller.