Changing cursor(Not in my form only).

I tried this code:
Private Const OCR_NORMAL As UInteger = 32512
<DllImport("user32.dll")> _
Private Shared Function LoadCursorFromFile _
(ByVal lpFileName As String) _
As IntPtr
End Function
<DllImport("user32.dll")> _
Private Shared Function SetSystemCursor _
(ByVal hCursor As IntPtr, _
ByVal id As Integer) _
As Boolean
End Function
<DllImport("user32.dll")> _
Public Shared Function LoadCursor(ByVal hInstance As IntPtr, _
ByVal id As UInteger) _
As IntPtr
End Function
Private Sub frm_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles MyBase.Load
Dim cursor As IntPtr = LoadCursorFromFile("C:\cursor.cur")
SetSystemCursor(cursor, OCR_NORMAL)
End Sub
Private Sub btn_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles btn.Click
SetSystemCursor(LoadCursor(IntPtr.Zero, OCR_NORMAL), OCR_NORMAL)
End Sub
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This code worked for changing the cursor, but it didnt return it back :(