New
#1
Page zoom.
Is it the 4000 or 7000?
Try this either way - Natural Ergonomic Keyboard 4000 | Device downloads | Microsoft Accessories
Yes, fearless leader (z3r010) is correct: I'm looking at one on my keyboard right now (I have a Natural Ergonomic 4000 in front of me). If you visit the Microsoft Mouse and Keyboard Center, you can download the latest drivers from there, using the Downloads link at top center. Here's the link straight to the Natural Ergonomic Keyboard 4000 download page. The latest version is 3.2.116 (which is what I now know I currently have installed).
HTH,
--Ed--