If you get error 0×80240029 while trying to update Windows Defender, see below for how to fix it. (This error usually occurs when the Software Distribution folder has become corrupted.)
First, log on to the user account by using administrative credentials and use one of the following methods:
Method 1
Manually install the Windows Defender Update Definitions
Click on the above link and follow the steps on the Microsoft site.
If that didn’t work, try…
Method 2: Rename the SoftwareDistribution folder
- Exit all programs
- Click Start, click Run, type cmd, and then click OK.
- At the command prompt, type the following command to rename the SoftwareDistribution folder:
net stop wuauserv
net stop bits
ren %systemroot%\SoftwareDistribution SoftwareDistribution.old
net start wuauserv
net start bits


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