You almost certainly do not need a separate driver.
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Don't waste time hunting for a driver. Plug it in, let Windows do its job, and enjoy your keyboard. Have a different Microsoft keyboard? Most models (Wireless 850, 900, 2000) follow the same rule – no separate driver needed. microsoft wireless keyboard 800 driver download
If you’ve just picked up a Microsoft Wireless Keyboard 800, you might be searching for a specific driver download to get it working. Let’s save you some time and potential security risks. You almost certainly do not need a separate driver
Microsoft Wireless Keyboard 800: Do You Really Need a Driver? (And Where to Find It) let Windows do its job