ZoomText DCM chain errors

Problem

When opening ZoomText you may get one of the following errors:

  • “An error has occurred in the DCM chain.”
  • “ZoomText has corrected an error in DCM chain. You must reboot your system before running ZoomText.”

Solution

  1. Press the Windows Key + R.
  2. Type regedit and press Enter to open the Registry Editor.
  3. On the left, navigate to:
    HKEY_LOCAL_MACHINE > System > CurrentControlSet > Control > DisplayChaining
  4. Right click on the “Display0” entry and click Delete.
  5. Close the Registry Editor.
  6. Go to the following folder:
    C:\Windows\System32
  7. Delete the “dcmc0d0.dll” file.
  8. Update your graphics card drivers.
  9. Restart the computer.
  10. Run ZoomText and you should see the following message:
    “ZoomText has corrected an error in DCM chain. You must reboot your system before running ZoomText.”
  11. Restart the computer and try running ZoomText again.

3 comments

  1. I followed your instructions and now my computer only uses VGA mode for the video driver. thanks alot. I cant even re-install the drivers. Nothing works.

    1. Can you post a link to the driver that you are trying to install?

      Also, why are you unable to reinstall the drivers? Do you get an error message?

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