This is a post to myself on how to fix this problem. The symptom is continuously getting the above alert from the WHS launchpad. The solution is linked here:

From user Dowlo:

I think I have resolved this now. Windows Update service was set to Automatic (Trigger Start) on the alerting machine, and Manual (Trigger Start) on my other machines. I reset it to Manual on the problem machine and the alert has not resurfaced since.

A little counter-intuitive, but there you have it.