Logitech mouse for ThinkPad

I’ve downloaded the driver for a Logitech
wheel mouse and installed it on an IBM
ThinkPad. Sometimes it works and
sometimes it doesn’t. When I restart I never
know if both the built-in track device and
mouse will 1) work, 2) not work, 3) track
device work without mouse working, or 4)
track device work with mouse working
erratically.

I’ve uninstalled and reinstalled the software
three times. Same random results every time.
Any ideas?

Thanks.

Mary