How to Fix the ISDone.dll Error

The ISDone.dll error often appears when installing or running games and software on Windows. It’s usually linked to insufficient memory or issues with the ISDone.dll or Unarc.dll files. In this guide, we’ll cover the main ways to resolve this problem.

1. Check System Requirements

This error can occur if your computer doesn’t meet the minimum requirements for running the program or game. Check that your system meets the necessary memory, processor, and graphics card requirements.

2. Increase the Paging File Size

If your system is low on RAM, Windows uses a paging file for temporary storage. If this file size is too small, it may trigger the ISDone.dll error. To increase the paging file size:

  1. Go to Control Panel → System and Security → System.
  2. Select Advanced system settings and navigate to the Advanced tab.
  3. Under Performance, click Settings → Advanced.
  4. In the Virtual Memory section, choose Change and set a custom size, such as 4-8 GB for both initial and maximum sizes.

3. Reinstall ISDone.dll and Unarc.dll

Sometimes, the issue stems from the ISDone.dll or Unarc.dll files themselves being corrupted. Try re-registering or reinstalling these libraries:

  1. Download fresh copies of the ISDone.dll and Unarc.dll files from a reliable source.
  2. Place them in the C:\Windows\System32 folder (or C:\Windows\SysWOW64 for 64-bit systems).
  3. Open Command Prompt as an administrator and enter these commands:
    regsvr32 ISDone.dll
    regsvr32 Unarc.dll

4. Run a System File Check

Corrupted Windows system files can also cause this error. Use the sfc utility to scan and repair damaged files:

  1. Open Command Prompt as an administrator.
  2. Type sfc /scannow and press Enter.
  3. Wait for the scan to complete and follow any on-screen instructions.

5. Ensure Sufficient Disk Space

Running low on disk space can cause errors during installations. Free up space by deleting unnecessary files, temporary files, and clearing your recycle bin if needed.

6. Temporarily Disable Antivirus Software

Some antivirus programs can interfere with file installation, causing the ISDone.dll error. Temporarily disable your antivirus before installation, but remember to enable it again afterward for system safety.

7. Try a Different Installation File

If the issue persists, the installation file may be corrupt. Download a fresh copy from an official source or try a different installer if available.