DISM, or Deployment Image Servicing and Management tool, is a Microsoft command-line utility that can be used to service and repair a Windows image. It can be used to fix problems with corrupt or missing files, drivers, and registry keys. DISM can also be used to install features and updates offline. In order to update the DISM tool, you need to first download the latest version from the Microsoft website. Once you have downloaded the file, you need to extract it to a folder on your computer. Next, open an elevated Command Prompt window and navigate to the folder where you extracted the files. To do this, type cd followed by the path of the folder (for example: cd C:dism). Once you are in the correct directory, type dism /online /cleanup-image /scanhealth and press Enter. This will scan your Windows image for any problems. If any errors are found, they will be fixed automatically. Finally, type dism /online /cleanup-image /restorehealth and press Enter. This will restore any corrupted files that were found during the scan process.