Driver needed, never had specific device driver, tried two both give erratic mouse behaviour from time to time.

Support Information:
Device Type: Input Devices (mouse, etc.)
Manufacturer: Fellowes
Model: 2 button basic wired PS2 mouse model 99939
Interface: Other
Operating System: Windows 98SE
Age of Device: Not specified
FCCID:

Find it on DriverGuide (http://members.driverguide.com/index.php?action=srch&sm=b&aax=&qa6=400&qa5=9&qa7=1301&dp=3&qm0=2+button+basic+wired+PS2+mouse+model+99939&jmd=and&fzz=d) | Find it with Google (http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=Fellowes+Input+Devices+%28mouse%2C+etc.%29++2+bu tton+basic+wired+PS2+mouse+model+99939+Windows+98S E+) | Research manufacturer Fellowes (http://members.driverguide.com/index.php?action=getinfo&companyid=400)

You don't need a driver.. you need to take the roller ball out and clean the lint off the 2 rollers.