When I start AutoCAD I receive an error message.

If you receive an error similar to the message below, the solution is to reinstall AutoCAD. AutoCAD did not register all of it's internal objects correctly. This has been a common problem when multiple versions of AutoCAD have been installed on the same computer. If you are running Windows 7 or Vista, turn off the UAC and uninstall then reinstall AutoCAD. This will usually solve any problem with the Autodesk.AutoCAD.Interop.AcadApplication or Autodesk.AutoCAD,Interop.AcadDocument error. If you are running Windows 7 or Vista, install AutoCAD by right mouse clicking on the installation program and choosing Run as administrator from the resulting popup menu.

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