ReportViewer Missing the attribute selection tab !!!

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reporting

i added a reportviewer control in my application and evrything works fine in Windows 7 32 bit OS .
but it is missing a tab which have an option to select an attribute for report generation only in Windows 7 64 bit OS.

Details:
-->Windows 7 Professional 64 bit OS
-->Microsoft ReportViewer 8.0.0.0
-->Microsoft Visual Studio 2005

tried various browers settings.nothing worked.

web.config file:

<system.web>

  <httpHandlers>
    <add path="Reserved.ReportViewerWebControl.axd" verb="*" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" validate="false"/>
  </httpHandlers>
  <compilation debug="true">
    <buildProviders>
      <add extension=".rdlc" type="Microsoft.Reporting.RdlBuildProvider, Microsoft.ReportViewer.Common, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
    </buildProviders>
    <assemblies>
      <add assembly="Microsoft.ReportViewer.WebForms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
				
    </assemblies>
  </compilation>
</system.web>

your thoughts on this plz!!?

Thanks in advance.