Open and run:

Run System File Checker (SFC)If the issue stems from broader Windows environment problems, the System File Checker can help. Open the Command Prompt as an administrator and type sfc /scannow . This utility will scan for corrupted system dependencies and attempt to repair them.

DLL download sites offer unverified, possibly outdated, or infected files. They also don’t know your exact AutoCAD version or language pack. Always use the official AutoCAD installer or repair process.