Dism Error 87 Fixed Site

Fixing DISM Error 87 — Technical Report

Abstract

DISM Error 87 ("The parameter is incorrect") commonly occurs when running the Deployment Image Servicing and Management (DISM) tool on Windows. This report explains causes, diagnostics, and a comprehensive set of solutions, including step-by-step commands, troubleshooting flowcharts, and preventive measures. Target audience: system administrators and advanced users troubleshooting Windows image servicing failures on Windows 7 through Windows 11.

How to Fix DISM Error 87 – 6 Proven Methods

Below are the most reliable fixes, ordered from simplest to most advanced. dism error 87 fixed

Wrong: DISM /Online /Cleanup-Image /RestoreHealth /Source = E:\sources (spaces around =) Fixing DISM Error 87 — Technical Report Abstract

Ensure spaces before every / and include the dash in /Cleanup-Image. No Admin Rights Right-click CMD and select "Run as administrator". Outdated Windows Install all pending updates in Settings. Service Stopped Enable "Windows Modules Installer" in Services. Incorrect Environment Use /Image instead of /Online if in Recovery Mode. and a comprehensive set of solutions

DISM /?

2. Use the Windows Update Source Explicitly

DISM /Online /Cleanup-Image /RestoreHealth /Source:WindowsUpdate /LimitAccess
  1. Ensure Windows Update/service access (for /RestoreHealth without /Source)

Now go ahead — run that command and watch your Windows image get repaired without a single error.