Antivirus deleted a needed DLL
One day a program suddenly fails to start β turns out antivirus removed a DLL
Typical symptoms
- Worked yesterday, suddenly missing a DLL today
- Antivirus recently ran a full scan
- The DLL shows up in the quarantine / suspicious-files list
- The same program breaks again after every fix
Official safe fix steps
-
Restore the file from the antivirus quarantine
360: "File Recovery" or "Quarantine" β find the .dll and click "Restore". Huorong: tray icon β Quarantine. Windows Defender: Windows Security β Virus & threat protection β Protection history.
-
Whitelist the software's install folder
Restoring alone is not enough β the antivirus will delete it again on the next scan. Add the program's install folder (Adobe apps, game folders, etc.) to the trusted / excluded list.
-
Reinstall the affected program from the official source
Some restored DLLs may be partially corrupted. A full reinstall from the official website gives you properly signed originals.
-
Verify the DLL has a valid Microsoft digital signature
Right-click the DLL β Properties β Digital Signatures tab. System DLLs should show a valid "Microsoft Corporation" signature. Unsigned DLLs are the main source of antivirus false positives.