modify zoom

[canvas]

Hi,

I need to block the zoom utility so that it can´t be modified using
ctrl+mouse wheel when the file opens. I´m working with userforms and I
´ve tried this code:

Private Sub Worksheet_SelectionChange (ByVal Target As Range)
ActiveWindow.Zoom = 52
End Sub

But I think this isn´t right for forms and in general. Can this be
done? or is there any way to deactivate the ctrl key?

Thanks!!