Judging by the number of views from the first Microsoft forum thread regarding the Windows Update error 0x80070643, it’s no exaggeration to state that tens of thousands of users have encountered this problem.

What does the Windows Update error 0x80070643 mean?

The error is likely caused by malware, file corruption, driver malfunction, or even improper system settings. The full error message states: There were problems installing some 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. Definition Update for Windows Defender – Error 0x80070643. Read on to find out how to solve the install error – 0x80070643 issue in no time and get back to using your PC without any problems. If you encountered the 0x80070643 error on Windows 11, check out our dedicated guide for more help.

How do I fix the Windows Defender 0x80070643 error?

1. Use antivirus removal tools

When you uninstall a third-party antivirus using the Uninstall option from Control Panel, some files might remain undetected, preventing you from running and updating Windows Defender. Even if you uninstalled your previous antivirus and have been using Windows Defender for quite some time without any problems, you’re not safe. The remnants of your previous antivirus may now be causing the 0x80070643 Windows Defender error, and since they are hard to remove manually, you need to deal with them some other way. This is where uninstaller software comes in handy to remove your antivirus or any leftover files. It is specially designed to remove the selected application and all its files and registry entries, leaving a clean space. Completely uninstall your old antivirus programs, restart your computer, and Windows Defender should be able to install the latest updates.

2. Check your system files

The System File Checker tool repairs corruption in system files. Use this tool to verify whether Windows Defender is corrupted, which could explain why you can’t install the updates. To perform an SFC scan, you need to do the following: If you can’t run the SFC scan or if SFC didn’t solve the problem, you might have to use a DISM scan instead. To do that, follow these steps: Once the DISM scan is finished, check if the problem is resolved. If the issue persists, or if you couldn’t run an SFC scan before, try rerunning the SFC scan and check if that solves the problem.

3. Perform a Clean boot

Third-party applications can sometimes interfere with Windows and cause Windows Defender update to fail and the Windows Update error 0x80070643 to appear. You might be able to fix it by performing a Clean boot. SPONSORED

4. Use a third-party antivirus software

If you want to avoid all the problems related to Windows Defender, you can switch to a better security tool, such as third-party antivirus software. Not only will this software do a better job at protecting your data from being stolen or stopping any virus from infecting your device. It should also have no errors or glitches. You will also benefit from other useful features that protect your PC and allow you to browse the internet carelessly and without worry.

5. Restart the Security Center Service

6. Perform a final manual update

7. Disable .NET Framework

According to people, sometimes .NET Framework can cause problems with Windows Defender updates. However, you might be able to fix this problem simply by disabling it. Several users suggest repairing your .NET Framework installation as a potential solution, so you might want to try that as well.

8. Check for updates from Windows Defender

Windows Defender will now download the available updates. In addition, several users reported that this method fixes the kb2267602 error 0x80070643 for them, so feel free to try it out. If you’re having problems with downloading updates, you might be able to fix the problem by trying to download updates directly from Windows Defender.

9. Reset Windows Update components

Sometimes there might be a bug with Windows Update components, which can cause the Windows Update error 0x80070643 error to appear. You might be able to fix the problem by running several CMD commands. By running these commands, you’ll stop all services associated with the Windows Update, rename the affected directories and then restart the services. This is a simple solution, so feel free to try it out.

What are some common Windows Defender issues?

Windows Defender offers solid protection, but if you want to keep your Windows 10 PC protected, it’s important to update Windows Defender regularly. Unfortunately, update issues can occur, and speaking of cases, these are some of the common problems that users reported:

Windows Defender update failed – If the Windows Defender update fails, the issue might be a third-party antivirus tool. If your previous antivirus isn’t completely removed, sometimes leftover files can interfere with Windows Defender and cause this issue to appear. To fix it, remove any leftover files. Windows Defender update stuck – Sometimes, your Windows Defender can get stuck during the update process. If this happens, be sure to repair your system files using both SFC and DISM scans. Windows Defender update connection failed – If you get this error message while trying to update Windows Defender, your third-party firewall might be an issue, so be sure to disable it or uninstall it. Windows Defender update won’t install – If the Windows Defender update doesn’t install, the issue might be a problematic application. However, you can fix the problem simply by performing a Clean boot. Windows Defender not getting updated / security intelligence update error – Several users claim that Windows Update components can cause this issue, so try resetting them and check if that solves the problem.

We’ve written extensively about Defender update problems before. So bookmark our article on what to do if Windows Defender won’t update in case you need it later. We hope these fixes work for you in solving the Windows Update error 0x80070643, related to Windows Defender. If you’ve found other workarounds for the Windows Defender 0x80070643 issue, tell us more about your experience in the comment section below.

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