In short:
often appears when you type the command incorrectly. The most common fix is to run the proper command: dism error 87 fixed
Boot from a Windows USB, open Repair tools → Command Prompt, then run DISM offline: In short: often appears when you type the
DISM only recognizes ( / ) for options. Backslashes ( \ ) will trigger Error 87 instantly. open Repair tools → Command Prompt
If none of these steps work, your system files might be severely corrupted. In such cases, you may need to perform a or a Cloud Reset to restore Windows without losing your personal files. Could you tell me: Which Windows version you're using (10, 11, or 7)? The exact command you typed into the prompt?