upgrading from sitecore 6.6 to sitecore 7.0

I am trying to update a Sitecore 6.6 instance to Sitecore 7.0. After logging in to the Sitecore administrative interface and launching the content editor, I receive the error:

Access is denied: 'Sitecore.Shell.Applications.ContentEditor.RenderingDatasource'.

Please help!

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