I am experiencing the same problem since the last set of updates. However, I am confused by the suggestion to uninsall update KB number 2976978 as this seems to be "diagnostics on the Windows systems that participate in the Windows Customer Experience Improvement Program". I am opted out of the Customer Experience Improvement Program so this service should not be running at all?
Can you suggest a resolution? It seems that Windows constant downloading, installing and assessing for updates takes up some much of the system resources that the computer is pretty much unusable.