The AVerMedia H797 PCI-E Combo NTSC/ATSC Windows driver is the software required to enable a AVerMedia H797 PCI-E Combo TV tuner card to work with a Windows-based computer. The H797 model is a TV tuner card that supports NTSC (National Television System Committee) and ATSC (Advanced Television Systems Committee) formats. These are the standard video formats used for analog and digital TV broadcasts, respectively, in North America.

The PCI-E Combo card allows you to watch and record over-the-air (OTA) TV broadcasts and digital cable (depending on the exact model and configuration) on your PC. It also typically allows for TV input functionality, where you can connect a TV antenna, cable, or other video sources to your computer.