Does someone have a clue?

I can't. Task Scheduler opens but is then inaccessible due to a pop up notification that will not go away.
It says "Task Scheduler service is not available. Task Scheduler will attempt to reconnect...

Version 1511, build 10586.420
AFAIK, this is not a Redstone build.

I noticed that my father's computer hasn't done backup for more than a month.Upon trying a manual backup, it gives the error:
"Windows could not launch the automatic backup job for the following...