I have Logitech wireless mouse and keyboard. I checked my settings in
the Logitech command and my middle button is set for "other" rather than
scroll. It still scrolls in word processing and spreadsheet programs
but zooms in AutoCad. Also in AC I have the "mbuttonpan" set at "0" so
I get the OSnap menu when I click the scroll wheel. Hope this helps.
You could try deleting your mouse driver. It worked for me when I had
the same problem with my mouse - although it meant I had to forego some
of my mouse's other functions, things I was never going to use anyway.
Warning: Before attempting this step, make sure know where your
reinstallation software is - just in case, and try to gain some
competency at navigating your way round your computer without using the
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