Unarc.dll Returned An Error Code 11 Windows 11 New! Review

Informative Report: “unarc.dll returned an error code 11” on Windows 11

Solution 5: Run SFC and DISM Scans

If system files related to memory management are corrupted, Windows might fail to allocate RAM correctly to the installer.

1. Press Windows Key + X and select Terminal (Admin) or Command Prompt (Admin).
2. Type the following command and press Enter: sfc /scannow
3. Wait for it to reach 100%. If it fixes files, restart your PC and try installing again.

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B. Adjust Windows 11 settings

• Disable Memory Integrity (Core isolation):
  Windows Security → Device Security → Core isolation → Memory integrity OFF (requires reboot).
• Increase page file size:
  System Properties → Advanced → Performance → Advanced → Virtual memory → Custom size (e.g., 8192–16384 MB).
• Enable long path support (if error 11 occurs late in extraction):
  Run as admin:

  reg add "HKLM\SYSTEM\CurrentControlSet\Control\FileSystem" /v LongPathsEnabled /t REG_DWORD /d 1 /f
  

  Then reboot.

4.9. Check Disk for Errors

• Open Command Prompt as admin → chkdsk C: /f /r (replace C: with target drive). Reboot.