ISDone.dll Error Fix: 10 Working Solutions for Windows Game Installation

ISDone.dll is a Windows system component that assists in decompressing installation files. It is commonly encountered during the installation of large-scale games.

An error involving this file usually indicates that Windows is unable to properly decompress the game installation package, causing the installation to be interrupted.

What typically causes this issue, and how can it be resolved? Let’s walk through the steps below.

What Causes ISDone.dll Errors

ISDone.dll errors usually occur when Windows is unable to extract or install large compressed game files due to insufficient RAM, disk errors, archive corruption, or antivirus interference.

The specific reasons are as follows:

• Insufficient RAM or virtual memory: If system memory is inadequate, Windows may be unable to complete the decompression process.
• Corrupted or incomplete game files: Missing or damaged installation files can prevent the game from decompressing correctly.
• Hard drive errors or insufficient disk space: Issues such as bad sectors or a lack of storage space can interrupt the installation process.
• Missing or corrupted DLL files (ISDone.dll / Unarc.dll): If essential system files are damaged or missing, the installation may halt due to an error.

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Common ISDone.dll Error Codes and Their Meaning

The ISDone.dll error may pop up when the installer fails to extract the file successfully.

Different error codes usually correspond to different sources of problems, such as file corruption, insufficient storage space, etc.

Here are some common error codes:

• Error code 1/12: Indicates an interrupted download or missing files.
• Error code 6: The installer cannot read the beginning of the compressed data block.
• Error code 7: The extracted data does not match the original data, indicating that the file is corrupted or missing.
• Error code 11: Windows ran out of available memory resources while processing the extraction process.
• Error code 14: Decompression failed or read/write error. This usually occurs during resource-intensive installations.

Now that you understand the common ISDone.dll error codes and their meanings, you can resolve the issue using the following methods.

How to Fix ISDone.dll Error

Most ISDone.dll errors can be resolved through a step-by-step troubleshooting process. It is recommended to try simpler methods before attempting more in-depth fixes.

Detailed solutions are provided below.

Fix 1: Increase Virtual Memory

Insufficient memory is one of the common causes of ISDone.dll errors.

When installing large games, the system requires additional virtual memory to decompress and process the files.

If the paging file is set too small, the installation process may fail.

At this point, you can try to increase the virtual memory.

Step 1: Press Win + R to open the Run box, type sysdm.cpl, and hit Enter.

Step 2: Navigate to the Advanced tab, and then click the Settings button in the Performance section.

Step 3: Click Advanced and click the Change button in the Virtual memory section.

Step 4: Uncheck the Automatically manage paging file size for all drives box. In the Custom size section, type the increased value in the Initial size and the Maximum size areas, and click OK.

Exit the window and restart your computer. After rebooting, just clean the %temp% folder.

1. Press Windows + R to open the Run box.
2. Type %temp% and press Enter.
3. Delete all the files present in the folder.

Now you can check if the error still occurs.

Fix 2: Temporarily Disable Antivirus/Defender

Windows Defender Firewall and antivirus software may prevent the installer from decompressing files, causing an ISDone.dll error or an unarc.dll error.

You can disable Windows Firewall or temporarily turn off your antivirus software and try again.

Step 1: Type Windows Defender Firewall in the search box and select Windows Defender Firewall.

Step 2: Click the Turn Windows Defender Firewall on or off tab on the left pane.

Step 3: Select the Turn off Windows Defender Firewall (not recommended) checkbox in both private and public network settings. Then click OK.

Restart your PC and try installing the game again.

If the ISDone.dll error continues, temporarily disable or uninstall third-party antivirus software and test again.

Fix 3: Install the Game in Safe Mode

Safe Mode starts Windows with minimal system services, thereby reducing background program usage and freeing up more memory.

This reduces interference from third-party software and helps resolve ISDone.dll errors caused by insufficient memory or program conflicts.

If normal installation fails, you can try reinstalling the game in safe mode.

Step 1: Press Win + R to open the Run box, type msconfig, and hit Enter to open the System Configuration window.

Step 2: In the new window, go to the Boot tab and select the Safe boot checkbox.

Step 3: Click OK and then Apply to save the change.

Restart your computer into safe mode. You can now install the game with the ISDone.dll error.

Fix 4: Perform SFC Scan and Repair Windows Image

Corrupted system files can prevent the installer from running correctly, triggering an ISDone.dll error. You can run the SFC and DISM tools to scan for and repair the relevant issues.

Step 1: Type cmd in the search box and choose Run as administrator.

Step 2: Type the sfc /scannow command and hit Enter.

Once the scan is complete, restart your PC. Any detected errors will be fixed automatically during startup.

If this command fails to work, you can try running a DISM scan.

Type the DISM /Online /Cleanup-Image /RestoreHealth command in the elevated command prompt and hit Enter.

Once the scan finishes, DISM will use Windows Update to repair the local system image by replacing any corrupted files it finds.

Fix 5: Check Disk

If the disk has bad sectors or file system errors, the installation process may fail with an ISDone.dll error. It is recommended to check for and repair disk issues.

Step 1: Type cmd in the search box and choose Run as administrator from the right side.

Step 2: Type chkdsk *: /f /r (* represents the drive letter) and press Enter.

• /f: Fixes errors on the disk.
• /r: Locates bad sectors and recovers readable information (includes /f).

Fix 6: Re-register ISDone.dll and Unarc.dll

If the ISDone.dll or Unarc.dll files are corrupted, missing, or not loaded correctly, the installer may fail to run properly. You can try re-registering these DLL files to restore their connection to the system.

Step 1: Open the Command Prompt again.

Step 2: Type the regsvr32 isdone.dll command in the elevated command prompt and hit Enter.

Step 3: After re-registering the isdone.dll file, type the regsvr32 unarc.dll command and hit Enter to re-register the unarc.dll file.

Fix7: Check RAM for Errors

Installing large games requires a significant amount of memory. If the memory has errors or is unstable, the installer may fail to decompress files correctly, triggering an ISDone.dll error.

You can use the built-in Windows Memory Diagnostic tool to check for issues.

Step 1: Type Windows Memory Diagnostic in the search box and click it to open.

Step 2: Click Restart now and check for problems.

Step 3: After the RAM test finishes, your computer will reboot automatically. If you want to see the test results, right-click the Start menu and select Event Viewer.

Step 4: Go to Windows Logs > System, click Find on the right pane, and type MemoryDiagnostic in the box. After clicking Find Next, you will see the results at the bottom of the window.

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Fix 8: Free Up Disk Space

The ISDone.dll error may occur if the target drive does not have enough free space for game installation and file extraction.

Check the available disk space and remove unnecessary files if needed.

If the partition is running out of space, you can use the Move/Resize Partition feature of MiniTool Partition Wizard to enlarge the partition and ensure sufficient space for the installation.

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Step 1: Launch MiniTool Partition Wizard to get its main interface.

Step 2: Select the partition that you want to extend and click the Move/Resize Partition feature on the left pane.

Step 3: In the pop-up window, drag the handle rightward to increase the hard drive space. You can also move the whole partition handle to change its location. After that, click OK.

Step 4: Click Apply at the top of the left corner to execute the change.

Once the partition has been extended, reinstall the game and see whether the ISDone.dll error is resolved.

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Fix 9: Perform a Clean Boot

Sometimes, background services or third-party programs can interfere with the game installation process and trigger the ISDone.dll error.

Performing a clean boot starts Windows with only essential services and drivers, helping you identify whether a software conflict is causing the issue.

Follow the steps below to perform a clean boot.

Step 1: Open the Run box, type msconfig, and hit Enter.

Step 2: In the new window, go to the Services tab and uncheck the Hide All Microsoft Services box.

Step 3: Click the Disable all button and Apply to save the change.

Step 4: Go to the Startup tab and click Open Task Manager.

Step 5: In the Task Manager tab, you need to disable all programs that may cause the error. After disabling all programs, close Task Manager and click OK.

Now, restart your computer and try installing the game.

Also read: Clean Boot Windows 11/10: What’s It? How to Perform? Full Guide!

How to Prevent ISDone.dll Error in the Future

To prevent ISDone.dll errors from recurring, you can use the following methods to maintain system stability and reduce installation issues.

• Maintain sufficient free disk space: Ensure the installation drive has enough available space to accommodate both the game files and the temporary files generated during the extraction process.
• Do not overclock your memory: Unstable memory overclocking can lead to game installation errors. It is recommended to stick to default settings.
• Update Windows: Keep your Windows system up to date.
• Download the installer from a trusted source: Corrupted or tampered-with installers can trigger ISDone.dll errors. Please download the installer from trusted, official channels.

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How to Fix ISDone.dll Error FAQ

Bottom Line

In most cases, ISDone.dll errors can be fixed by increasing virtual memory, freeing disk space, or disabling antivirus software. If the issue persists, checking RAM or reinstalling the game may help.

If you have any questions or feedback about MiniTool Partition Wizard, feel free to contact our support team at [email protected] for additional help.