Switch to the tab in the new window, then click Change... under Virtual memory .
Type the following command and press Enter: regsvr32 unarc.dll
2 Errors: game instability and unarc.dll installation issue.
Outdated storage drivers or a missing Windows update can cause error code 1. how to fix unarc dll returned an error code 1
Corrupted data in your temporary folders can interfere with the decompression process. Windows + R , and hit Enter. Delete all files in this folder. Windows + R again, type , and hit Enter. Delete all files in this folder as well. Restart your computer. 2. Disable Antivirus and Windows Defender Antivirus software may mistakenly block or the decompression process, labeling it as a threat. Temporarily disable your third-party antivirus or Windows Real-time protection Try running the installer again as an Administrator 3. Increase Virtual Memory (Paging File)
Check both your source setup folder and your target installation directory. Ensure they do not contain any special characters.
Your PC will boot into a stripped-down version of Windows. Run your game or software installer now. Switch to the tab in the new window, then click Change
Temporarily turn off Windows Security or your third-party antivirus before starting the installation.
Wait for the verification to complete. If it repairs corrupted files, restart your PC and try installing the application again. Method 5: Clear Temporary Files
Temporarily disable or your third-party antivirus (Avast, AVG, etc.). Outdated storage drivers or a missing Windows update
Ensure the drive you are installing to has at least double the space of the final game size to accommodate temporary extraction files. If you want to troubleshoot further, tell me: What game or software are you trying to install? How much physical RAM does your PC have? Are you using a repack installer (like FitGirl or DODI)? Share public link
If you are dealing with a "repack" (a highly compressed game), check the source of the download, as the repacker's tools may be incompatible with your system. If you'd like, I can:
Lack of write permissions to the C: drive or specific folders can trigger this error.
The (SSD or HDD) where you are installing the files.