Let’s fix it. In 90% of cases, Error 87 is caused by a missing colon after Online . Many old tutorials omit the colon, but modern Windows versions require it strictly.
Open CMD as Administrator. Step 2: Type DISM /? and press Enter. This shows the full help menu. Step 3: To see syntax for specific operations, use:
If you are copying commands from a website, paste them into Notepad first and look for auto‑formatted slashes. If you are unsure about a specific DISM switch, let DISM teach you the correct format. dism error 87 fixed
By carefully reviewing your command, ensuring /Online: has the colon, and running the tool with administrative privileges, you will resolve this error in under two minutes. For the rare cases where the error persists, repairing your system files with SFC or switching to PowerShell will get the job done.
In this comprehensive guide, we will explain what DISM Error 87 means, why it happens, and provide to fix it permanently. What is DISM Error 87? DISM (Deployment Imaging and Service Management) is a built-in command-line tool in Windows 10 and Windows 11. It is used to repair the Windows system image, including the recovery environment and Windows PE. Let’s fix it
DISM /Online /Cleanup-Image /RestoreHealth
DISM /Online: /? DISM /Image: /? DISM /Cleanup-Image /? If a particular switch doesn’t appear in the help list, it doesn’t exist in your version of Windows (e.g., some switches are only for Windows PE). If your path contains spaces or unusual characters, wrap the path in double quotes and escape spaces properly. Open CMD as Administrator
Now that you know how to fix DISM Error 87, you can return to repairing your Windows image and keeping your PC healthy. Do you have a specific DISM command that still triggers Error 87? Check the official Microsoft documentation for DISM syntax or leave a comment below for a tailored fix.