Windows Update failed to install – Error 0x80070643

The KB4048955 update for Windows 10 introduced some quality improvements and other elements that claimed to resolve security vulnerabilities. However, a bug caused error 0x80070643 to pop up every time the users tried to install the update. Error 0x80070643 is a general Windows Update installation error code that can appear on your computer screen during installation.

Here are few fixes:

1] Rename the SoftwareDistribution folder

2] Clear Catroot2 folder contents

3] Run Windows Update Troubleshooter

4] Install Windows Updates in Clean Boot State

[aye_djay]

worked at step 1 much better than reinstalling windows. you saved me

[AryanDurgapal]

Thanks so much me bhuat pareshan tha kisi video se fix nahi ho raha tha apne kr dia thanks 🥺🥺

[kazue]

step 3 is the easiest one and reasonable one if you guys are like me who don't wanna mess something up with that cmd.. and that troubleshooter fixed my problem with ease Thankyou

[adityacodz]

Thank you so much. The first method works! :D

[kestradalp]

Hello, I have w11 and the other day I received this update and it gives this error "'Security Update for Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package (KB2538243) Installation error: 0x80070643". Could you help me to solve it?

[krittansaha]

By following the step 1 only it worked fine . thanks bro

[rohitagrawal]

I use your method but sir still error showing

[cafeAFS]

I have Windows 10 21H1 / 19043.1083 ! I did all the steps in the video and it didn't fix my system! Windows Defender update error 0x80070643 continues!!!!

[SillyEngineer]

When i am trying to delete the contents of (catroot2) it says it is being used by another app, how do i go around that.

[sahilrajawat]

thank you so much sir it Thanks a lot sir 😊😊😊

[hypergamingop]

Bro plz help me I do that and now my game gets a lot low FPS 1 I use to 150 now only 25 and I format also then also plz help I don’t all ur steps and my FPS drops start now u only help

[kristphercoco]

Thank you so much. I was so frustrated. I went into bios to check fan curve (changed nothing) exited and it was stuck in windows repair mode. I ended up rolling back system and it worked but then i got this issue. Thank you sooo so much!

[UNKNOWNVOICE]

Thnks bro I was able to fix thnka alot

[jordanj]

thank you i was able to fix my problem