New
#21
Download:Download: Security Update for Windows 7 for x64-based Systems (KB2579686) - Microsoft Download Center - Download Details
Create the directory C:\Windows\CheckSur\packages
Copy the downloaded msu files there
Re-run System Update Readiness Tool
Then,
Open up a command prompt as admin and run: "net stop wuauserv"
Then navigated to C:\Windows\SoftwareDistribution and deleted the contents of the download folder as well as "C:\Windows\SoftwareDistribution\DataStore\DataStore.edb"
(note, this erases your update history)
Then open up a command prompt as admin and run: "net start wuauserv"
Reboot
Re-run windows update.