If you need a custom source:
If you are unsure about a specific DISM switch, let DISM teach you the correct format.
System registry issues blocking service initialization.
Sometimes the legacy Command Prompt parser is the issue. PowerShell handles parameters differently.
DISM Error 87 Fixed: Complete Guide to Solving "The Parameter is Incorrect" dism error 87 fixed
Ensure you are pointing to the correct file inside your installation media, usually located in the sources folder.
Older Windows versions (7, 8, early 10) don’t support all modern DISM parameters. Check your version:
Let’s be clear: Error 87 does mean your system is broken. It means your instruction to DISM is broken.
DISM /Online /Cleanup-Image /RestoreHealth /Source:E:\sources\install.wim:1 Error: 87 Diagnosis: The user mounted an ISO, but Windows assigned it drive F: , not E: . Fix: Changed E: to F: . If you need a custom source: If you
First, I need to understand what error 87 means. DISM error 87 is "The parameter is incorrect." It usually happens when a command is mistyped, a syntax error, or an invalid option is used. So the article should explain that, then provide solutions.
The System File Checker (SFC) and DISM work hand-in-hand. If DISM is glitching due to corrupted core files, running SFC can patch the underlying issue, allowing DISM to function normally afterward. Open . Type sfc /scannow and press Enter . Wait for the verification to reach 100%. If it fixes errors, restart your PC.
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DISM /Online /Cleanup-Image /CheckHealth PowerShell handles parameters differently
DISM /Online /Cleanup-Image /RestoreHealth /Source:WIM:e:\sources\install.wim:1
Understanding DISM Error 87 When managing a Windows system, the Deployment Image Servicing and Management (DISM)
DISM /Online /Cleanup-Image /RestoreHealth /Source:WIM:E:\sources\install.wim:1