This is the standard Logitech Mouse Driver provided on the Windows 98 2nd Edition CDROM and it is installed with Windows 98 2nd Edition. Windows automatically accessed the driver and installed it when I plugged the mouse into my 3D accelerator, which is the only port I have available on my PC. I hope this will help anyone with driver difficulties. There is a full software set for setting button properties that came on a CD with the mouse, but I have lost track of that CD (this is my wife's old mouse that I upgraded to from a cheap MS mouse). If I find that CD or any other info on this mouse, I will attempt to provide that information and/or files... GOOD LUCK!