Prevent Certain Key Combinations

I am trying to prevent certain keyboard shortcut combination keys from being pressed. Mostly I want to stop people from pulling up the task manager by CTRL + ALT + DEL. Here is what I have tried so far:

Private Sub Form_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyDown
        If (e.Control) Then
            KeysPressed += "True"
        ElseIf (e.Alt) Then
            KeysPressed += "True"
        ElseIf (e.KeyCode = Keys.Delete) Then
            KeysPressed += "True"
        End If

        If (KeysPressed.IndexOf("TrueTrueTrue")) Then
            e.Handled = True
        End If
    End Sub



Private Sub Form_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyDown
        If (e.Control And e.Alt And e.KeyCode = Keys.Delete) Then
            e.Handled = True
            MessageBox.Show("Handled")
        End If
    End Sub


Neither of these will handle multiple keys pressed at once. They both handle them in the order they occur. Any help would be great! Thanks!

Strickdd