The command dism /online /cleanup-image /restorehealth is a powerful Windows utility used to repair the Windows System Image by scanning for corruption and automatically fixing issues using files from Windows Update.
What the Command Does
- DISM (Deployment Image Servicing and Management): The core tool for preparing and repairing Windows images.
- /Online: Tells the tool to target the operating system currently running on your PC.
- /Cleanup-Image: Specifies the operation category (maintenance of the system image).
- /RestoreHealth: Scans the Windows component store for corruption and replaces any damaged or missing files with healthy copies.
When to Use It
- System Instability: Use it if your PC is freezing, crashing, or showing “Blue Screen of Death” errors.
- Windows Update Failures: It can often resolve issues where Windows updates fail to install.
- Before sfc /scannow: Microsoft recommends running this DISM command before running sfc /scannow. This ensures that the “source” files SFC uses for its own repairs are healthy.
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