Hi,
Check which updates are failing to install and post back the same.
Let’s try these steps and check.
Step 1: You may temporarily disable security software’s and check if the issue persists. Make sure to enable those security software's on the computer after checking.
http://windows.microsoft.com/en-us/windows7/Turn-Windows-Firewall-on-or-off
http://windows.microsoft.com/en-US/windows7/Disable-antivirus-software
If disabling the security software resolves the issue then, please contact the specific security software manufacturer to resolve the issue.
ImportantThese steps may increase your security risk. These steps may also make the computer or the network more vulnerable to attack by malicious users or by malicious software such as viruses. We recommend the process that this article describes to enable programs to operate as they are designed to or to implement specific program capabilities. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this process in your particular environment. If you decide to implement this process, take any appropriate additional steps to help protect the system. We recommend that you use this process only if you really require this process.
**Step 2:**Reset Windows Update components
Refer: http://support.microsoft.com/kb/971058 (this article may also be useful for windows 7)
Troubleshoot problems with installing updates
http://windows.microsoft.com/en-US/windows7/Troubleshoot-problems-with-installing-updates