If you're encountering errors when trying to use the DISM tool, it's likely that your Windows component store is corrupted. This can happen for a number of reasons, but most commonly it's caused by an incomplete or interrupted Windows update.
Luckily, there are a few different ways that you can attempt to fix this problem. First, try running the SFC (System File Checker) scan. This will check for any corrupted system files and attempt to repair them. If that doesn't work, you can try using the DISM tool again with a different command line argument. For example, instead of using DISM /Online /Cleanup-Image /RestoreHealth, try DISM /Online /Cleanup-Image /Scanhealth.
If neither of those methods work, then your last resort is to perform a clean install of Windows. This will completely erase your hard drive and reinstall Windows from scratch. Obviously, this is a pretty drastic step, so make sure you've tried everything else first!