How to Fix DISM Error 87 on Windows 10

Encountering errors while using built-in diagnostic tools in Windows 10 can be frustrating, especially when you rely on them to fix corrupted system files. One common issue users face is the DISM Error 87. This error usually appears when attempting to run the Deployment Imaging Service and Management Tool (DISM), and often results from incorrect command usage, outdated operating systems, or corrupted files.

Fortunately, this issue is well-documented and can be resolved with a few systematic steps. In this article, we’ll guide you through understanding, identifying, and fixing DISM Error 87 so you can restore your system’s stability.

What Causes DISM Error 87?

Error 87 is typically accompanied by the message: “The parameter is incorrect.” This can be caused by several issues, including:

• Incorrect command syntax: Typing the DISM command incorrectly is a leading cause of this error.
• Running commands without administrative privileges: DISM requires elevated rights to operate.
• Corrupted Windows image: A damaged Windows image can disrupt the DISM operation.
• Outdated Windows version: Older builds of Windows 10 may not fully support the current DISM commands.

Step-by-Step Guide to Fix DISM Error 87

1. Use the Correct Command Format

The most common mistake leading to this error is incorrect syntax. For example, many people omit the spaces between parameters. To run the DISM tool properly, use:

DISM /Online /Cleanup-Image /RestoreHealth

Note: Ensure there is a space before each forward slash ( / ). If you do not type the command exactly as shown, you are likely to encounter Error 87.

2. Run Command Prompt as Administrator

The DISM tool needs administrative rights to function correctly. To do this:

• Click on the Start menu and type Command Prompt.
• Right-click it and select Run as administrator.
• Accept the User Account Control prompt if it appears.

Once the elevated Command Prompt is open, retry the command.

3. Update Your Windows 10

If you’re using an outdated version of Windows 10, there could be compatibility issues with DISM. Make sure your system is updated:

1. Go to Settings > Update & Security > Windows Update.
2. Click on Check for updates.
3. Install any pending updates and restart your PC.

Once updated, try running the DISM command again.

4. Use the System File Checker First

Sometimes, system corruption can interfere with DISM operations. It is a good practice to run the System File Checker (SFC) before using DISM. Here’s how:

sfc /scannow

Allow the scan to complete (this may take some time). Once done, reboot your system and attempt to use DISM again.

5. Check for Image File Corruption

If you are attempting to use DISM with an image file and still receiving Error 87, verify the ISO or image for damage. You can mount a clean ISO and then specify it as the source for DISM like so:

DISM /Online /Cleanup-Image /RestoreHealth /Source:wim:X:\sources\install.wim:1 /LimitAccess

Replace “X” with the drive letter of your mounted ISO.

6. Use Windows PowerShell as an Alternative

If Command Prompt isn’t working as expected, try using Windows PowerShell with administrative privileges:

• Search for Windows PowerShell.
• Right-click and choose Run as administrator.
• Enter the same DISM command as before.

Conclusion

DISM Error 87 can prevent you from repairing vital system files, leaving your system vulnerable to performance and stability issues. However, by following the methods above—with attention to proper command syntax and privilege levels—you can effectively resolve this error.

Always ensure your system is up to date and free from corruption by periodically running maintenance commands like SFC and DISM. If these steps do not resolve the issue, you may be facing deeper problems that require a full system restore or professional support.