Windows Update error 800706ba can occur if an update installation crashes.
To correct the problem, you need restart your computer, and then run Windows Update again by following these steps:
Open Windows Update by clicking the Start button . In the search box, type Update, and then, in the list of results, click Windows Update.
In the left pane, click Check for updates, and then wait while Windows looks for the latest updates for your computer.
If any updates are found, click Install updates.
If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
If you continue to see this error, see this automatic troubleshooter
on the Microsoft Support website, or go to the Microsoft Answers
website for more assistance.
Error codes this applies to: