Hi,
Thank you for posting your query in the Microsoft Community forum. I understand
that you get error 800703FA while trying to install KB2310138. Let me help you fix the issue.
Before proceeding with the troubleshooting, provide us with the information.
1.
What is the make and model of the computer?
2.
Do you have any other security software installed part from Security Essentials?
3.
Is the issue confined to this update?
4.
Did you make any changes to the computer prior to the issue?
There issue might occur if there is a mismatch between the definitions file update
from the update KB article and the definitions file update from the installed version of Microsoft Security Essentials. Let us try these methods:
Method 1.
Run a full computer scan with the Microsoft Safety Scanner to make sure that the
computer is virus free.
Microsoft Safety Scanner:
http://www.microsoft.com/security/scanner/en-us/default.aspx
Safety Scanner Disclaimer:
There could be a loss of data while performing a scan using Microsoft safety scanner to eliminate virus if any.
Method 2.
You may uninstall and reinstall Microsoft Security Essentials and check the status.
How to manually uninstall Microsoft Security Essentials 2.0.1963 if you cannot
uninstall it by using the Add or Remove Programs item: http://support.microsoft.com/kb/2483120
To do so:
Important this section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection,
back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: How
to back up and restore the registry in Windows
For Windows XP: 322756 (http://support.microsoft.com/kb/322756/)
For Vista : Back up the registry :
http://windows.microsoft.com/en-us/windows-vista/Back-up-the-registry
For Windows 7: Back up the registry:
http://windows.microsoft.com/en-US/windows7/Back-up-the-registry
Let us know if you need further help with any windows issue. We will be glad to help.