Quick note about cookies
To provide you with the best possible experience, we use cookies and similar technologies for performance, analytics, personalization, and advertising purposes, as well as to support the operation of our website.
See our
cookie policy
for more information.
You can change your preferences at any time via the "Cookie preferences" link in the footer.
Accept
How to Fix Unarc.dll Returned an Error Code 1: A Comprehensive Guide
This 2,500-word guide will walk you through 12 proven methods to fix Error Code 1, from simple reboots to advanced command-line repairs.
Manual Re-registration:
Type DISM /Online /Cleanup-Image /RestoreHealth and press Enter to repair the Windows image.
Click Set → OK → Restart your PC.
Download a clean unarc.dll from a trusted source (only from official DLL libraries or another working PC).
Copy it to C:\Windows\System32 (for 64-bit) or C:\Windows\SysWOW64 (for 32-bit apps).
Press Windows + R, type regsvr32 unarc.dll, and hit Enter.
Important:
Verify the file size matches the website description. A 45GB game showing 44.3GB on disk is definitely corrupt.
6. Check Disk Space
to at least double your physical RAM (e.g., 16384 MB for 8GB RAM). 4. Re-register Unarc.dll and Isdone.dll
How To Fix Unarc Dll Returned An Error Code 1 -
How to Fix Unarc.dll Returned an Error Code 1: A Comprehensive Guide
This 2,500-word guide will walk you through 12 proven methods to fix Error Code 1, from simple reboots to advanced command-line repairs.
Manual Re-registration:
Type DISM /Online /Cleanup-Image /RestoreHealth and press Enter to repair the Windows image. how to fix unarc dll returned an error code 1
Click Set → OK → Restart your PC.
Download a clean unarc.dll from a trusted source (only from official DLL libraries or another working PC).
Copy it to C:\Windows\System32 (for 64-bit) or C:\Windows\SysWOW64 (for 32-bit apps).
Press Windows + R, type regsvr32 unarc.dll, and hit Enter.
Important:
Verify the file size matches the website description. A 45GB game showing 44.3GB on disk is definitely corrupt. How to Fix Unarc
6. Check Disk Space
to at least double your physical RAM (e.g., 16384 MB for 8GB RAM). 4. Re-register Unarc.dll and Isdone.dll Click Set → OK → Restart your PC