DISM Error 87 — Cause, step-by-step fixes, and practical tips

DISM (Deployment Image Servicing and Management) error 87 (“The parameter is incorrect”) appears when a DISM command is entered with incorrect syntax, unsupported parameters, or when required system components are unavailable. Below is a concise, methodical guide to diagnosing and fixing Error 87 plus practical tips to avoid it.

4. Diagnostics Checklist (run in order)

1. Confirm running elevated Command Prompt / PowerShell (Run as Administrator).
2. Verify exact command syntax: check spacing, colons, and switch names.
3. Run dism /? and dism /online /? to list supported options and confirm availability of the subcommand.
4. Confirm OS architecture and DISM executable path:
   • where dism
   • Get-Command dism (PowerShell)
   • check %windir%\system32\dism.exe is used on 64-bit systems (system32 on WOW64 redirection).
5. Check for stray characters or Unicode hyphens copied from web pages—retype dashes manually.
6. Run sfc /scannow to detect system file corruption.
7. Check DISM and Windows version compatibility:
   • dism /online /get-currentedition
   • dism /online /get-targeteditions
8. Inspect logs:
   • %windir%\Logs\DISM\dism.log
   • %windir%\Logs\CBS\CBS.log Search for "Error: 87" and adjacent context.
9. If using /Source, validate that the source path is correct and contains required files (install.wim, install.esd) and matches the OS build.
10. Confirm networking and Windows Update service if DISM uses online sources.

Q2: Can error 87 occur on Windows 11?

Yes. Windows 11 has the same DISM engine as Windows 10, so error 87 can occur from typos or unsupported old commands.

10. Conclusion

Error 87 is most often a syntax, context (online vs offline), or environment issue. Systematic verification of command syntax, elevation, DISM binary path, and correct source media resolves most instances. When persistent, in-place upgrade or reinstallation with matching media is a reliable fallback.

If you want, I can convert this into a full-length formatted paper (with references, a troubleshooting flowchart image, and a sample dism.log analysis) sized for printing or academic submission — tell me the target length (e.g., 2,500–5,000 words) and any citation style.

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Here’s a concise and clear guide to fixing DISM Error 87 (which usually means an invalid parameter in the command syntax):

Step-by-Step Fixes

5. Escape Special Characters Properly

If your source path has spaces, enclose it in quotes:

/Source:"E:\sources\install.wim:1"

Scenario 1: Running DISM /Online /Cleanup-Image /RestoreHealth

You see: Error: 87 – The restorehealth option is unknown.

Common Scenarios Where Error 87 Appears

Users most commonly encounter Error 87 when running:

• DISM /Online /Cleanup-Image /CheckHealth
• DISM /Online /Cleanup-Image /ScanHealth
• DISM /Online /Cleanup-Image /RestoreHealth

However, the error can also appear when using /Get-Packages, /Add-Driver, or /Apply-Image commands.

3. Repair Windows with Installation Media

• Mount your Windows ISO or insert the installation USB.
• Note the drive letter (e.g., D:).
• Run:

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