Security update unable to download and install

Something is preventing my computer from downloading an important Security update. How can this be fixed? See details below:

Security Update for Windows Media Format Runtime 11 for Windows Vista for x64-based Systems (KB954155)
Installation date: ‎11/‎17/‎2009 8:36 PM
Installation status: Failed
Error details: Code 80073712
Update type: Important
A security issue has been identified that could allow an unauthenticated remote attacker to compromise your system and gain control over it. You can help protect your system by installing this update from Microsoft. After you install this update, you may have to restart your system.
More information:
Microsoft Security Bulletin MS09-051 - Critical: Vulnerabilities in Windows Media Runtime Could Allow Remote Code Execution (975682)
Help and Support:
Microsoft Support

Error details: Code 80073712

Click to expand...

This error address to corruption in C:\Windows\Servicing and C:\Windows\WinSxS folders.

Solutions: filling missing files (only if damages are not too big),Repair Instalation,System Restore.

Prepare below logs:

.Run cmd.exe with administrative previlliges (right click on cmd.exe as admin) and type:

sfc /scannow

when it finish type the following commnad:

findstr /c:"[SR]" %windir%\logs\cbs\cbs.log >%userprofile%\Desktop\sfcdetails.txt

on your desktop appear sfcdetails.txt - it will be needed to diagnose

2.If you ran Readiness Tool,it should create CheckSur.log file in C:\Windows\Logs\CBS folder

both files: CheckSur.log,sfcdetails.txt pack and attache to post