This is a driver that works with the HP Internet Keyboard Serial Number 5185-1596. This keyboard was sold with the HP Pavilion XT983. The properties of the keyboard show a different keyboard, but it works just the same. This driver was orginaly downloaded at http://drivers.soft32.com/driver/download-A4tech_KBS_21_KB_21_Multimedia_Keyboard-25107.html
I discovered it when I googled for an Omega keyboard. I got the clue when trying to install the Windows 98 driver. It had mentioned that this is either a Godzilla or Omega kayboard. Again it worked for me with XP Home.
I have added a photo of the keyboard so that you will know if it is the driver you are looking for.