Missing or out-of-date export dll

Hi Experts

I am using crystal reports 8.5. I am trying to convert a report file to a pdf file in run time using a small vb program.

.Export False  - Raises an error  " Missing or out-of-date export dll. "

Reference
Crystal reports 8.5 Activex Designer run time library

Private Sub Command1_Click()
    Dim CRAPP As New CRAXDRT.Application
    Set CRReport = CRAPP.OpenReport("C:\activitylist.rpt")
    lstrFileName = "c:/activitylist.pdf"
    With CRReport
        .ExportOptions.DestinationType = crEDTDiskFile
        .ExportOptions.DiskFileName = lstrFileName
        .ExportOptions.FormatType = 31
        .DisplayProgressDialog = False
        .Export False
    End With
End Sub

Checked these two dlls.
U2fcr.dll    
u2ddisk.dll

They were in 2 places C:/Windows/Crystal and C:/Windows/System32. I have renamed  the above 2 dlls from the system32.

But I still face this problem
Any Suggestions