Access is denied when I try to save data to XML Document that has write permission on the folder

I have read all the threads about saving node changes back to an xml file but my problem is a little different.  I am loading an XML file using XML Dom into a table with a checkbox to choose a node  that needs to be modified which then forwards the data to a form.  The user makes the changes and submits to the code below .  And before going forward I did release all references to the xml object.

     'Instantiate the Microsoft XMLDOM.
        Set objDom = Server.CreateObject("MSXML2.Domdocument.4.0")
         call objDom.setProperty("ServerHTTPRequest", true)  
         objDom.preserveWhiteSpace = True
         objDom.async = false  
       
     'Call the Load Method of the XMLDOM Object.
     call objDom.Load (server.MapPath("..") & "location of xml file")
               
If objDom.parseError.errorCode <> 0 Then
Response.Write "There was an error loading the xml file!<br>"
Else
Response.Write "XML loaded.<br>"
End If
'Get values from form
 for each variable_name in request.form
if variable_name <> "strEditSubmit" then      
   
   Set objNode = objDom.documentElement.selectSingleNode(variable_name)
    If objNode is Nothing then
         response.write("There is no node" & "<br>")
      else
      if objNode.Text <> request.form(objNode.NodeName&"_oldvalue") then
          objNode.Text = request.form(variable_name)
          objDom.Save server.MapPath("..") & "path to xml file"
         end if
      end if
From the above I get an accessed denied error.  There is nothing wrong with the folder. It has write permission set and it is working as I can write to other files in that same folder.  In addition if I make a copy of the above referenced file being loaded and rename it and reference the renamed file  the above code works perfectly and writes to the renamed file.  I have read many threads on experts exchange but I haven't found one like this.  I am very new to XML so please be patient.  
 I am doing something wrong but WHAT?
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