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Right-click the AutoCAD icon and select "Run as Administrator." Method 1: Repair the Installation
Repair or reinstall a corrupt AutoCAD installation - Autodesk
Check the OpenLaunch and PrintLaunch keys. Ensure the string explicitly points to the correct location of your acad.exe file (typically found in C:\Program Files\Autodesk\AutoCAD 2021\acad.exe ). 2. Repair or Reset the AutoCAD 2021 Installation
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Once you've resolved the issue, taking a few preventative measures can save you from future headaches.
Damaged Windows registry keys can misdirect AutoCAD, preventing it from locating its installation path.
Right-click your AutoCAD 2021 desktop shortcut and choose . Look at the Target field under the Shortcut tab. Right-click the AutoCAD icon and select "Run as
Restart your computer and test AutoCAD. If the error persists, repeat the steps but select Reinstall instead. 4. Manually Replace the acadres.dll File
The acadres.dll (AutoCAD Resource DLL) file contains essential localized resources. These include menus, icons, dialogues, and string tables required to display the AutoCAD user interface. If this file is missing, corrupted, or blocked, AutoCAD cannot build its visual environment and will crash instantly upon startup. Common Causes of the Error
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: A failed update or an interrupted installation process can leave the DLL file incomplete or missing. Antivirus Interference
If found, select the file and choose or Add to Exclusions . Restart your computer and try launching AutoCAD. 3. Perform a Repair or Reset of AutoCAD 2021
If the steps above fail, the installation package itself may be corrupted. Uninstall AutoCAD 2021 via the Control Panel. Delete the following folders manually: C:\Program Files\Autodesk\AutoCAD 2021 C:\Users\%Username%\AppData\Local\Autodesk\AutoCAD 2021 Disable your antivirus temporarily.
Ensure the path matches where AutoCAD is actually installed (usually C:\Program Files\Autodesk\AutoCAD 2021 ). Method 4: Perform a Clean Reinstall