ADODB.Stream Pdf's are corrupt on Windows 2000 Clients

This is a real strange one.

90% of all browsers and clients are fine, but some windows 2000 machines say that
the pdf is corrupt when opened from a browser.  

Does anyone have any ideas on what is going on

Code is below

Sub DownloadFile(file, lstrName)

      '--declare variables
      Dim strAbsFile
      Dim strFileExtension
      Dim objFSO
      Dim objFile
      Dim objStream
      '-- set absolute file location
      strAbsFile = Server.MapPath(file)

      '-- create FSO object to check if file exists and get properties
      Set objFSO = Server.CreateObject("Scripting.FileSystemObject")

      '-- check to see if the file exists
      If objFSO.FileExists(strAbsFile) Then

            Set objFile = objFSO.GetFile(strAbsFile)

            '-- first clear the response, and then set the appropriate headers
            Response.Clear
            '-- the filename you give it will be the one that is shown
            '   to the users by default when they save
            Response.AddHeader "Content-Disposition", "attachment; filename=" & lstrName
            Response.AddHeader "Content-Length", objFile.Size
            Response.ContentType = "application/octet-stream"
            
            Set objStream = Server.CreateObject("ADODB.Stream")
            objStream.Open
            
            '-- set as binary
        objStream.Type = 1
        Response.CharSet = "UTF-8"
       
            '-- load into the stream the file
        objStream.LoadFromFile(strAbsFile)
       
            '-- send the stream in the response
        Response.BinaryWrite(objStream.Read)
       
            objStream.Close
            Set objStream = Nothing
            
            Set objFile = Nothing
            
      Else  'objFSO.FileExists(strAbsFile)

            Response.Clear
            Response.Write("No such file exists.")

      End If

      Set objFSO = Nothing

End Sub