This is the file I downloaded directly from Microsoft's Web Site.. Here is the URL if this isn't the one that you are looking for.. http://www.microsoft.com/hardware/mouseandkeyboard/productlist.aspx?type=Keyboard there is a list of others. This driver supports 9 different Microsoft Keyboards, including Wireless Natural, and a line of the Wireless keyboards and Mice they sell. Already Scanned and Virus Free.. Using Norton Anti-Virus Pro.