Click Cell To Open Userform

Hi I have inserted the following code to open a userform when a blank cell is clicked. This works fine but what i need it to do is make it only open the userform when any of the Column A Cells A20:A174 are clicked. Is it also possible to make the user have to double click the cell to open the userform and disable the right mouse click

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
If Target = "" Then Menu.Show
End Sub

Try this

Private Sub Worksheet_BeforeDoubleClick(ByVal Target As Range, Cancel As Boolean)

    If Target.Count > 1 Then Exit Sub'remove,not required

    If Not Application.Intersect(Target, Me.Range("A20:A174")) Is Nothing Then

        Cancel = True

        If Target = "" Then Menu.Show

    End If

End Sub

No problem,
I suppose you don't require the Target.count part of the code, as you can only double click one cell anyway