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Microsoft backported some DISM features to Windows 7 via an update (KB2966583), but the version shipped with Windows 7 natively does support the commands you see in modern Windows 10 guides.
If so, move to Fix 2. Fix 2: Update Your Windows 7 DISM Tool (The "KB2966583" Fix) If you receive Error 87 even when using the /Source parameter, your DISM binary is too old to understand the /RestoreHealth argument at all.
If you have the option, upgrade to Windows 10/11 for repair operations. Microsoft has effectively abandoned DISM servicing for Windows 7 as of January 2023. Have a different error code? Let me know in the comments below.
Let’s break down exactly why this happens on Windows 7 and how to fix it for good. Here is the hard truth most tutorials won't tell you: DISM on Windows 7 is ancient.