Model: 5302 Keyboard
Operating System: Windows 98SE (Note: might work with other versions of this os.)
Before downloading: Run Free Scan for Instant Driver Updates
Click Drivers. Click HP Drivers. Entre product number 6720.
Entre Keboard. Click on Drivers and Downloads.
Blue box (select one) click on Driver then click on Multimedia Keyboard Driver Update to download. This file of 5.03MB has a self extractor zip. Then just install. Works fine for me.