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The failed Security Agent installation is due to the Windows update KB2918614 issue that reportedly causes software installations and upgrades to fail for multiple products that use the Windows installer packages (.msi).
To resolve the issue, you need to remove the Microsoft KB2918614 update:
  1. Open Control Panel and click Windows Update.
  2. Click Update History > Installed Updates.
  3. Scroll down to Microsoft Windows and look for KB2918614.
  4. Uninstall KB2918614 and reboot the computer.
  5. Try to install again the Security Agent. The installation should be successful.
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