DISM typically means "The parameter is incorrect." It occurs when Windows cannot recognize the command you've entered, usually due to formatting mistakes, lack of administrative rights, or service issues . 1. Correct the Command Syntax
If you copied a command from a website, ensure it doesn’t include placeholder text like <source> or brackets. For example: dism error 87 fixed
Follow these best practices to never see Error 87 again: Error 87 DISM typically means "The parameter is incorrect
– Label it with the exact install.wim index numbers. Keep a Windows USB handy – Label it
DISM requires administrative privileges to access and modify system files. If the command is run in a standard Command Prompt window, the system will reject the "parameter" because it lacks the authority to execute the requested action. menu and type Right-click Command Prompt and select Run as Administrator Re-run the DISM command in the elevated window. 3. Verification of Command Availability