Add a new module with the following pasted into it!
Option Compare Database
Option Explicit
Global Const SW_HIDE = 0
Global Const SW_SHOWNORMAL = 1
Global Const SW_SHOWMINIMIZED = 2
Global Const SW_SHOWMAXIMIZED = 3
Private Declare Function apiShowWindow Lib "user32" _
Alias "ShowWindow" (ByVal hwnd As Long, _
ByVal nCmdShow As Long) As Long
Function fSetAccessWindow(nCmdShow As Long)
'Usage Examples
'Maximize window:
' ?fSetAccessWindow(3)
'Minimize window:
' ?fSetAccessWindow(2)
'Hide window:
' ?fSetAccessWindow(0)
'Normal window:
' ?fSetAccessWindow(1)
'
Dim loX As Long
Dim loForm As Form
On Error Resume Next
Set loForm = Screen.ActiveForm
If err <> 0 Then 'no Activeform
If nCmdShow = SW_HIDE Then
MsgBox "Cannot hide Access unless " _
& "a form is on screen"
Else
loX = apiShowWindow(hWndAccessApp, nCmdShow)
err.Clear
End If
Else
If nCmdShow = SW_SHOWMINIMIZED And loForm.Modal = True Then
MsgBox "Cannot minimize Access with " _
& (loForm.Caption + " "

_
& "form on screen"
ElseIf nCmdShow = SW_HIDE And loForm.PopUp <> True Then
MsgBox "Cannot hide Access with " _
& (loForm.Caption + " "

_
& "form on screen"
Else
loX = apiShowWindow(hWndAccessApp, nCmdShow)
End If
End If
fSetAccessWindow = (loX <> 0)
End Function
You will then need to call the function as fSetAccessWindow(0) to hide the Access Window and then call fSetAccessWindow(3) to restore the window (you must restore the window at the end or the next time you open Access you will have problems)
These are called on the 'OnOpen' part of your form.
Hope it helps!
Jon