If you're using windows 7, there's a issue with the updater.
(You can watch the updater with Resource Monitor and see MB's tick away from in-use to free..then it will 'hang' for an hour or two..but, it will eventually update.)
You can try installing this kb:
https://support.microsoft.com/en-us/kb/3102810
But, note that language pack installations require re-installing it.
EDIT: And watch out for the Windows 10 'pre-positioner' KB..I clicked on every update to see what they did...