Can't find DLL entry point.....user32

[Maximillian]

I am using Vb6 and trying to hide or disable the form close button.
The code I am using is below.
On my development machine (WinXP sp2.0) this works but on the target machine (WinXP sp2.0) I get the following error
Can't find DLL entrypoint GetSystemMenu in user32.

Can any body help!!

Private Const MF_BYPOSITION = &H400
Private Const MF_REMOVE = &H1000
 
Private Declare Function DrawMenuBar Lib "user32" _
      (ByVal hwnd As Long) As Long
      
Private Declare Function GetMenuItemCount Lib "user32" _
      (ByVal hMenu As Long) As Long
      
Private Declare Function GetSystemMenu Lib "user32" _
      (ByVal hwnd As Long, _
       ByVal bRevert As Long) As Long
       
Private Declare Function RemoveMenu Lib "user32" _
      (ByVal hMenu As Long, _
       ByVal nPosition As Long, _
       ByVal wFlags As Long) As Long
 
 
 
Private Sub Form_Load()
 
   Dim hMenu As Long
   Dim menuItemCount As Long
 
  'Obtain the handle to the form's system menu
   hMenu = GetSystemMenu(Me.hwnd, 0)
  
   If hMenu Then
      
     'Obtain the number of items in the menu
      menuItemCount = GetMenuItemCount(hMenu)
    
     'Remove the system menu Close menu item.
     'The menu item is 0-based, so the last
     'item on the menu is menuItemCount - 1
      Call RemoveMenu(hMenu, menuItemCount - 1, _
                      MF_REMOVE Or MF_BYPOSITION)
   
     'Remove the system menu separator line
      Call RemoveMenu(hMenu, menuItemCount - 2, _
                      MF_REMOVE Or MF_BYPOSITION)
    
     'Force a redraw of the menu. This
     'refreshes the titlebar, dimming the X
      Call DrawMenuBar(Me.hwnd)
 
   End If
   
End Sub