Navigate to: HKEY_CURRENT_USER\Software\Autodesk\DwgCommon\shellex\apps\F29F85E0-4FF9-1068-AB91-08002B27B3D9: AutoCAD .
Since security software is the primary culprit, you must check your quarantine log. problem loading acadres.dll resource file autocad 2021
usually indicates a corrupted installation, a blocked file by security software, or a damaged desktop shortcut a blocked file by security software