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. If you are running Windows 7 or Vista, when starting the AutoCAD program, right mouse click on the desktop icon and choose Run as administrator from the resulting popup menu. Error referencing AutoCAD application: Unable to cast COM object of type 'System._ComObject' to interface type 'Autodesk.AutoCAD.Interop,AcadApplication'. This operation failed because the Queryinterface call on the COM component for the interface with IID '{8F17437C-2EFB-4FC4-8188-EEFA50FE7147}' failed due to the following error. No such interface supported( Exception from HRESULT:0x80004002(E_NOINTERFACE)). If you are running AutoCAD 2008 and receive this error message, download the file below into the C:\Program Files\Software Republic\RCLI 5 AutoCAD\2007 folder and answer Yes to overwrite the existing dll file. http://www.softwarerepublic.com/downloads/AutoCAD-2008/RCLI%205%20AutoCAD.dll

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