How To Prevent Auto Macros From Running

I have made a vba program in excel 2003 that opens a worksheet using Workbooks.Open, and copies all the worksheets out into the program etc. The worksheets that I am opening have macros that automatically execute when the worksheet is opened (opening up some forms ). These macros are running when I open the file using VBA. How can I prevent this from happening. The automatically executed code in the workbook being opened is located in "this workbook" and can be seen below.

Private Sub Workbook_Open()
Dim CfileName As String
'Check Config sheet for template state
If Config.Cells(10, 3) = 1 Then
CustomizeDirInfo.Show
End If

If Config.Cells(10, 3) = 2 Then
GetConfData
GetGrpData
StdFileGen.Show
Else
Exit Sub
End If
End Sub