Windows Update error 80070643


Windows Update error 80070643 can happen for several reasons. The most common cause is a problem with the .NET Framework installed on the computer. You might also encounter this error when installing updates for Microsoft Office 2003. If you were installing Microsoft Office 2003 updates when you received the error, follow the instructions in the "Microsoft Office 2003" section below. Otherwise, follow the instructions in the "Windows .NET Framework" section.

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Windows .NET Framework

The .NET framework is a part of Windows that's used to build, deploy, and run programs. Since multiple programs use the .NET Framework, problems can occur from hard disk corruption or faulty program installations, which can cause an update to fail.

The steps to resolve the problem are intended for advanced users. If you're not comfortable performing these steps, ask a friend or support professional to help you. You'll find the steps in the .NET Framework article on the Microsoft website.

Microsoft Office 2003

To fix this problem, you might need to restart the Office Source Engine (OSE) service and try to install the latest updates for Office products again.

To restart the Office Source Engine (OSE) service

You must be logged on as an administrator to perform these steps.

  1. Open Administrative Tools by clicking the Start button Picture of the Start button, and then clicking Control Panel. In the search box, type administrative tools, and then click Administrative Tools.

  2. Double-click Services. Administrator permission required If you're prompted for an administrator password or confirmation, type the password or provide confirmation.

  3. If the Office Source Engine service is disabled, double-click it to open the service properties.

  4. Click the Startup type list, click Automatic (Delayed Start), and then click Apply.

  5. Under Service status, click Start.

For more information about restarting the OSE service, see the Microsoft Office updates article on the Microsoft website.

If you continue to see this error, see this automatic troubleshooter on the Microsoft Support website, or go to the Microsoft Answers website for more assistance.

Error codes this applies to:

  • WindowsUpdate_80070643

  • WindowsUpdate_643

  • 643

  • 0x643

  • 0x80070643



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