When I try to try to update Microsoft Windows Defender I receive an error message that resembles the following: Error found: Code 0x80240029
How to resolve this?

The problem may occur because of one or more of the following circumstances:
• You may be experiencing a Windows Update issue.
• The SoftwareDistribution folder may be corrupted.

Methods to resolve the problem
To resolve this problem, log on to the user account by using administrative credentials, and then use one of the following methods.

Method 1: Manually install the Windows Defender Update Definitions
Microsoft delivers Windows Defender updates by using Windows Update. In some cases, you may receive errors because of problems from one of these services that are not related to Windows Defender itself. The first step is to try to manually install the update definitions. To manually install the update definitions, follow these steps:
1. Visit the Security Portal. To do this, visit the following Microsoft Web site:
2. Follow the appropriate steps.
3. If you still receive "Windows Defender Definitions haven't been updated" warning messages, you might want to ask someone for help or contact support. For information about how to do this, visit the following Microsoft Web site:
http://go.microsoft.com/fwlink/?linkID=21608 (http://go.microsoft.com/fwlink/?linkID=21608)

Note The following methods contain advanced troubleshooting steps. If you are not comfortable with advanced troubleshooting, you might want to ask someone for help. No charge support is available for consumers by calling 1-866-PCSAFETY in the United States and in Canada or by contacting your local Microsoft subsidiary. For more information about how to contact your local Microsoft subsidiary for update support issues, visit the following Microsoft International Support Web site:
http://support.microsoft.com/common/international.aspx

Method 2: Rename the SoftwareDistribution folder
1. Exit all open programs.
2. Click Start, click Run, type cmd, and then click OK.
3. 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