I have been encountering this issue with window's update for almost 3 months. I have used the troubleshooter, fix-it and diagnostics but till date unable to resolve.
Two important updates have yet to be installed.
1)
Internet Explorer 11 for Windows 7 for x64-based Systems
2)
Security Update for Windows 7 for x64-based Systems (KB2868725)It's been bothering me and please advise.