Windows Update failed to install – Error 0x80070643
Error 0x80070643 is a general Windows Update installation error code that can appear on your computer screen during installation.
1] Rename the SoftwareDistribution folder
Error 0x80070643 can either stop you from installing Windows update or installing another software. This issue may occur either due to the corruption of the MSI software update registration or if the .NET Framework installation on the computer has become corrupted.
To solve this, it is advisable to rename the SoftwareDistribution folder. To rename the Software Distribution folder, open an elevated command prompt windows, type the following commands one after the other, and hit Enter:
net stop wuauserv
net stop bits
rename c:\windows\SoftwareDistribution SoftwareDistribution.bak
net start wuauserv
net start bits
Next clear the contents of the Catroot2 folder.
2] Clear Catroot2 folder contents
Catroot and Catroot2 are some of the important Windows OS folders which are required while Windows Updates process. So, if you are facing the problem while updating your Windows and receiving an error message – 0x80070643, then reset the Catroot2 folder.
To reset the catroot2 folder do this:
Open an elevated Command Prompt, type the following command one after the other and hit Enter:
net stop cryptsvc
xcopy %systemroot%\system32\catroot2 %systemroot%\system32\catroot2.old /s
Next, delete all the contents of the catroot2 folder.
Having done this, in the CMD windows, type the following and hit Enter:
net start cryptsvc
Your catroot folder will be reset, once you start Windows Update again.
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