Dism Error 87 Fixed Best ✦ No Sign-up

: Running the tool inside a standard Command Prompt instead of an elevated administrator window.

If the online repair tool fails, force DISM to use a physical Windows installation media file.

Windows deployment tools keep your operating system running smoothly. The Deployment Image Servicing and Management (DISM) tool is your primary defense against corrupted system files. However, running into can stall your repair efforts entirely.

The DISM tool is highly sensitive to formatting. The most frequent cause of Error 87 is forgetting to place a space each forward slash ( / ). Incorrect: DISM.exe /Online /Cleanup-image /Restorehealth Correct: DISM.exe /Online /Cleanup-Image /RestoreHealth dism error 87 fixed

Note: Reproducing requires specific misuses; in practice Error 87 is flagged before long operations complete.

Ensure there is a space before /Online , /Cleanup-Image , and /RestoreHealth .

DISM.exe /Online /Cleanup-image /Restorehealth (Missing spaces before the slashes) : Running the tool inside a standard Command

If the syntax is correct but you are still seeing Error 87, try these steps. 1. Use PowerShell (As Administrator)

A simple restart can release locked files that may be causing a parameter conflict. 3. Run SFC (System File Checker) First

Execute the following command (replace E with your actual mounted drive letter): DISM /Online /Cleanup-Image /RestoreHealth /Source:WIM:E:\sources\install.wim:1 /LimitAccess Conclusion The Deployment Image Servicing and Management (DISM) tool

Understanding the root cause helps prevent the error from recurring. The most common triggers include:

If specifying a repair source (e.g., from a Windows ISO mounted as D: ):

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.

If the syntax is correct but the error persists, the service responsible for Windows updates and repairs might be disabled. How to Fix DISM Error 87 on Windows 10 - PCrisk.com

Double-click the downloaded ISO file to it to your system. Note the drive letter assigned to it (e.g., Drive D: or E: ). Open Command Prompt as Administrator .