Error Code: 0x80070643 (Windows Defender can't install definition updates)

i keep getting a message stating windows defender cant instal definition updates, what should i do? should I remove the program and reinstall it? Thanks
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. 

The .NET framework is a part of Windows that's used to build, deploy, and run programs and applications. Unfortunately, it can be damaged by some programs, viruses, or hard disk problems.

To repair the .NET Framework automatically
  1. Click on the below link


Repair .NET Framework


If this post helps to resolve your issue, please click the "Mark as Answer" If you find it helpful , Mark it as helpful by clicking on "Helpful" button at the top of this message. By marking a post as Answered, or Helpful you help others find the answer faster.

124 people found this reply helpful


Was this reply helpful?

Sorry this didn't help.

Great! Thanks for your feedback.

How satisfied are you with this reply?

Thanks for your feedback, it helps us improve the site.

How satisfied are you with this reply?

Thanks for your feedback.


Question Info

Last updated July 21, 2021 Views 43,124 Applies to: