Disable Print Screen Key to the Windows Environment

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

I'm trying this:

Code:

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

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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