After searching for a driver for my Kensiko Dual Scroll Mouse for W2kPro to no avail, I tried the kensiko site. The driver link referred me to A4Tech, and I downloaded this file from them for the 4D model mouse (2wheel, 3button). This file will work will all OS's from W95 through XP. Some great new features added I've enjoyed and hope you do too. Email me if you have problems, I'll directly email you a copy. Installation was standard, required a reboot to set an icon in the systray, completely painless. Also allows emulation for MS Intellimouse and features for MSOffice shortcuts.