How to fix Windows update error code 643

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Updated onOctober 4, 2023

updated onOctober 4, 2023

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Some users have stated on forums that they get anerror code 643when they tryinstalling Windows updates. Error code 643 is an updateerrorthat occurs more frequently inWindows 7, 8 and 8.1. Theerrorblocks Windows from updating. Here are a few resolutions that might fix error code 643.

SOLVED: Windows error 643

1. Open the Windows Update Troubleshooter

TheWindows Updatetroubleshooter fixes numerous update errors. So, thattroubleshootermight provide a resolution for error code 643. You can download theWindows Updatetroubleshooter forWin 10, 8 or 7 fromthis webpage.Win 7and 8 users can clickDownload troubleshooter forWindows 7and Windows 8to save thetroubleshooter.

Then open thetroubleshootershown directly below from the folder you saved it to. ClickAdvancedand selectApply repairs automatically. Then selectWindows Update, and press theNextbutton to go through thetroubleshooter‘s steps.

2. Turn Off Anti-Virus Software

Third-party anti-virus software can conflict withWindows Update. Some users have confirmed that disabling anti-virus software can fix error code 643. To temporarily disable an anti-virus utility, right-click its system tray icon and select a disable or turn off option on its context menu. If you can’t find a disable option on the anti-virus utility’s context menu, have a look through the settings on the software’s primary window. Alternatively, you can turn off anti-virus software via Task Manager’s Start-up tab as follows.

— RELATED:Fix Windows update issues with these two tools

3. Fix NET Framework with the NET Framework Repair Tool

Error code 643 is often due to a corruptedNET Frameworkinstallation. You can fixNET FrameworkwithMicrosoft’s NET Framework tool, which you can download fromthis webpage. Then open the utility’s window, and click theI accept the license termscheck box. Press theNextbutton to initiate the repair utility.

4. Repair NET Framework Client Profile via the Control Panel

Windows 7 users can repair theNET FrameworkClient Profile via the Programs and Features Control Panel applet. That Control applet lists installedNET Frameworkversions inWindows 7, which you can select to repair from there. This is how you can repair theNET FrameworkClient Profile inWin 7.

— RELATED:“This might take several minutes”Windows updateerror [FIX]

5. Reinstall NET Framework

As a last resort, reinstallNET Framework. Set up a system restore point that you can go back to before you uninstallNET Framework. Then reinstallNET Frameworkas follows.

Some of those resolutions might fix error code 463 soWindows updates. In addition, theDeployment Image Servicingcommand-line utility might also come in handy for fixing error code 463. ThisFix Windows Updates pagealso provides resolutions that could fix error code 463 and other updateerrors.

How to fix Windows update error code 643#

SOLVED: Windows error 643#

1. Open the Windows Update Troubleshooter#

2. Turn Off Anti-Virus Software#

3. Fix NET Framework with the NET Framework Repair Tool#

4. Repair NET Framework Client Profile via the Control Panel#

5. Reinstall NET Framework#