Overview
Windows update C8000643 indicates Microsoft windows can not be updated and the upgrade will stop.  In this article we have given step by step instructions to resolve the issue.

Please bookmark this page by pressing Ctrl+D in your browser so that you can visit this page again, if your system restarts during the resolution process.

windows update error

Disclaimer:
The steps given below involves changing system setting and it can damage your PC if the steps are not followed properly. It is highly recommended that these steps  should be followed under supervision of an Expert technician. We will have no responsibility or liability in relation to any loss or damage that occurs in the process.

Affected Operating Systems:

  • Windows 10/Windows 10.1
  • Windows 8/8.1
  • Windows 7
  • Windows Vista

Common Error message:

  • C8000643 – Windows could not search for new updates. An error occurred while checking for new updates for your computer. Some updates were not installed.
  • Error(s) found: Code C8000643 Windows update encountered an unknown error.
    Windows update ran into a problem.
  • There were some problems installing updates, but we’ll try again later If you keep seeing this and want to search the web or contact support for information, this may help – C8000643
  • Windows Update Cannot Check For Updates – C8000643
  • Something went wrong, Please try again later. Windows update error dt_000 – C8000643

Reason for error:

The error usually occurs while updating windows, upgrading windows and installing new windows updates. Windows update can also cause Microsoft office (Outlook,Word,Excel etc) to throw C8000643 error.  The error can occur due to following reasons:

  1. Internet Connection issue.
  2. System Ports being blocked.
  3. System Level conflict..

How to Fix Windows update C8000643 error:

  • SFC Scan

Open Command Prompt in elevated mode. To open Command prompt in Windows 10, type CMD in search bar (“Ask me anything“) and right click on it and Click on “Run as Administrator“. And in the next window click on Yes.

SFC scan

In command prompt type the following command:

sfc /scannow

sfc scan result

  • Disable Skype/Antivirus

Sometimes Skype and any installed antivirus can conflict with windows update. While updating the windows disable them. You can enable them once the update is done successfully.

If  Windows update C8000643 error still persists even after following the above steps, it means the issue is critical and it should be fixed by manually replacing the update files. It is highly recommended to talk to one of our Support specialist to get the issue resolved.


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Last Updated: 03/11/2015
Solution ID: 63276

Posted In: Windows Update

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