What is the purpose of the 'DISM /Online /Cleanup-Image /RestoreHealth' command, and when should I use it during Office installation?

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Grade: Education Subject: Support
What is the purpose of the 'DISM /Online /Cleanup-Image /RestoreHealth' command, and when should I use it during Office installation?
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DISM is a command-line tool used to repair the Windows image. 'DISM /Online /Cleanup-Image /RestoreHealth' attempts to repair corrupted system files, which can sometimes resolve installation errors. Use it if SFC fails to fix the issue.