This error may be the result of a issue with the setup. On your installation media for Visual Studio 2005, locate the VSTOR.exe file. Double click on the VSTOR.exe file to re-run the installation for the VSTO Runtime. Once this completes test with the Excel and Word projects to see if you still receive the error. Regards, Ken Laws MSFT This posting is provided "AS IS" with no warranties, and confers no rights. For more information regarding Visual Studio Tools for Office 2005: Best of Blogs: Visual Studio 2005 Tools for Office http://msdn.microsoft.com/library/default.asp?url=/library/en-us/odc_2003_ta/html/odc_landvsto2005_ta.asp Visual Studio Tools for Office Forum http://forums.microsoft.com/msdn/ShowForum.aspx?ForumID=16 Visual Studio Tools for the Microsoft Office System http://msdn.microsoft.com/office/understanding/vsto/default.aspx |