Disable Print Screen Key to the Windows Environment

[Piazza]

How do I disable the Print Screen Key to the Windows Environment?

I'm trying this:

Private Sub txtText_KeyDown(KeyCode As Integer, Shift As   Integer) 
    If KeyCode = vbKeyPrint or KeyCode = vbKeySnapshot then 
        KeyCode = 0 
    End If 
End Sub

But, when I press the Print Screen Key the event isn't fired. *ONLY* with Print Screen Key!!!

And it only applies to my application, not to the Windows Environment...

Thanks in advance,

Piazza