The SMI Grabber Device driver typically refers to software that supports a hardware device designed for capturing video or images (commonly referred to as a "grabber" or "capture card"). The acronym SMI usually stands for Silicon Motion, Inc., a company that manufactures a variety of video and multimedia solutions, but it's possible that "SMI Grabber" could refer to different hardware or software, depending on the context.
If you are encountering this driver on your Windows PC, it's likely that you are dealing with some form of video capture or image grabbing hardware from Silicon Motion or another manufacturer. Here's a general guide on how to install the driver: