Here is the code for disabling paste using right mouse click... I am sure the user can take care of insert like the way I took care of Ctrl + V

Code:
Private Sub Text1_KeyPress(KeyAscii As Integer)
    '~~> Ensures numbers are not keyed it
    '~~> Also ensure the user is not able to paste number
    If KeyAscii > 47 And KeyAscii < 58 Or _
    KeyAscii = 22 Then KeyAscii = 0
End Sub

'~~> Disable paste using right click
Private Sub Text1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    If Button = vbRightButton Then
    Clipboard.Clear
    End If
End Sub