How To Fix Unarc.dll Returned An Error Code 14 Jun 2026
Decompressing massive, highly optimized archives requires a stable system memory. If your RAM has bad sectors or unstable overclocks, data corruption occurs during extraction.
Type sfc /scannow and press . Wait for the verification to reach 100%.
If you use a third-party antivirus (e.g., Avast, Malwarebytes, Kaspersky), right-click its icon in the system tray and select option to disable it temporarily (e.g., "Pause protection for 1 hour").
Click next to your active power scheme, then select Change advanced power settings .
Antivirus software frequently interferes with decompression routines because the rapid unpacking of files can mimic malicious behavior. how to fix unarc.dll returned an error code 14
Select your system drive and set a . (e.g., set both Initial and Maximum to 8000 MB if you have 8GB RAM) . 3. Clean Temporary Files
The security software wrongly identifies the unpacking process as a threat.
The installer exhausts available RAM, and the Windows Pagefile is too small to handle the massive overflow of uncompressed data.
High-end processors running at max overclock speeds can overheat or produce minor clock-cycle mismatches when unzipping tightly bound archives. Downclocking or cooling your CPU often bypasses this roadblock. Option A: Throttle the Power State Wait for the verification to reach 100%
Check the box and reduce the active allocation dropdown to a lower threshold (e.g., limit a 16-core CPU down to 8 active cores).
Bad sectors on your Hard Disk Drive (HDD) or Solid State Drive (SSD) can prevent files from being written properly.
Press , type cmd , right-click Command Prompt , and select Run as administrator .
Antivirus software is a very common cause of this error. It may quarantine the unarc.dll file or block the installer from making changes. right-click Command Prompt
Under the tab, click Settings in the Performance section.
High-end, multi-core CPUs processing intense extraction tasks can overheat or outpace system memory stability. Limiting the processor's maximum performance envelope prevents these synchronization faults. Adjust Power Plan Settings:
Press Win + R , type prefetch , and clear that directory as well.
If your initial installation file is missing even a few kilobytes of archive structure, unarc.dll will fail at that specific percentage marker. Open your torrent client (such as qBittorrent).
Open a final Run window, type prefetch , and clear out the system prefetch cache. Comparison of Methods Troubleshooting Method Primary Focus Best Used For Success Rate
Press the , type cmd , right-click Command Prompt , and choose Run as administrator . Type the following command and press Enter : DISM.exe /Online /Cleanup-image /Restorehealth Use code with caution.