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

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!!

vb Code:

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

Did you do a formal installation on the target machine or just copy the program over?

Just copied the program over. I created a new project with only this code in it -ran it ok on dev PC then copy and paste onto target.
Thanks

The only way copying will work is if VB itself is installed on the machine.

You must create a form installation and setup package, send the package to the desired machine, and have the user of the machine run the resulting Setup.exe to install your program.

Thanks for the reply. I have VB installed on both machines. I can copy the project on to either machine hit F5 and it runs no problem on the first PC. On the second it falls over at the hmenu = getsystemmenu(me.hwnd,0).
User32.dll must be present on the machine and there is but a single version of it -right?

Are the versions and service packs identical on both machines?

Yes -same VB6 install, both XP sp2.
What us user32? Does it install with VB or belong to windows?

User32.dll is a Windows core and basic dll. Its on all versions of Windows.

See here for the definition and specifics.
http://allapi.mentalis.org/apilist/GetSystemMenu.shtml

Compare the date/time stamp and size of user32.dll on the machine without the problem and the user32.dll file on the machine with the problem.

Its shouldnt matter as the API call is available in versions of Windos back to NT 3.1 and 95

It would matter if the file is corrupt.

Would a corrupt file show a modification/revision version change?

If it was corrupt then there would be more appearant "issues" thoughout all of his Windows, no?