Can you try to disable our addin before you start VisualStudio?
Please open the
c:\program files\telerik\openaccess\sdk\IDEIntegrations\Microsoft Visual Studio 2005\addin\OpenAccessAddin80.addin
file in a text editor and set the load behavior to 0. If this fixes the problem, it is a known problem with some VS2008 installations. I do not know another way, you have to reinstall VS2008.
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