See www.lebans.com/mousewheelonoff.htm for one way.
Or, you can set the Cycle property of the Form to Current Record.

Signature
Ken Snell
<MS ACCESS MVP>
>I accidentally discovered that if you are in a bound form you can 'scroll'
> through the records of the form's recordsource by using the mouse scroll
> button. Is there a way to disable this?
>
> Jim B