what is DISM ?

RANDOLPH FREYTAG 0 Reputation points
2026-06-07T14:15:22.67+00:00

i have the stop code oxc000021a and i need DISM , what is it? Moderator note: moved from System Center Service Manager

Windows for home | Windows 11 | PC Health Checker
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  1. AI answer

    2026-06-07T14:15:31.0333333+00:00

    DISM (Deployment Image Servicing and Management) is a built-in Windows command-line tool used to service, repair, and manage Windows images and the running Windows installation.

    Key points:

    • DISM can service Windows image files (.wim, .ffu, .vhd, .vhdx) and also the currently running operating system.
    • It is used to install, uninstall, configure, and update Windows features, packages, drivers, and international settings.
    • It can check and repair corruption in the Windows component store and other system files, which is often needed when troubleshooting serious errors and update failures.
    • DISM is included with Windows and located in C:\Windows\System32, and must be run from an elevated (Run as administrator) Command Prompt or via PowerShell.
    • DISM is also available in the Windows Assessment and Deployment Kit (Windows ADK) if a different version is required.

    DISM is commonly used together with System File Checker (SFC) to repair missing or corrupted system files when Windows is unstable or showing critical errors.

    References:

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  2. Emma1-N 13,150 Reputation points Microsoft External Staff Moderator
    2026-06-07T23:54:33.2133333+00:00

    Welcome RANDOLPH FREYTAG,

    Thank you for reaching out to Microsoft Q&A forum.  

    I understand you are encountering the stop code 0xc000021a and want to know what DISM is. 

    Before proceeding, I’d like to clarify a couple of things: 

    • Are you able to boot into Windows, or are you stuck on a blue screen or recovery environment? 
    • Have you already tried any commands like SFC or startup repair? 

    In the meantime, you can try these steps:  

    What DISM is: you can find the AI answer previous to know clearly 

    About the code oxc000021a: you can try the steps below to troubleshoot the issue:  

    Option 1: Boot into Advanced Startup Repair

    • Turn the device on and interrupt the boot process 2–3 times until recovery options appear
    • Select Troubleshoot > Advanced options > Startup Repair
    • Follow the on‑screen instructions

    Option 2: Use System Restore (if available)

    • Go to Troubleshoot > Advanced options > System Restore
    • Choose a restore point before the issue started
    • Complete the restoration process

    I hope the steps above help you deal with your issue.  

    P.S: If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".      

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