This driver is for PS/2 Micro Optical Scroll mouse for Windows '98 & 2000.
Step-n-Scroll, Optical Sensing Technology.
I had lost the floppy that came in the box and found it again later....but that was after I had did a intense search on the Net for the driver. Micro Innovations do not carry this particular driver...in fact looks like they have not updated their Driver Web page for some time.
Cheers and happy surfing.