I go to change the trigger from daily to weekly (Monday) and when I go back in every so often, it is back to daily.

How to I get it to stop reverting back?

This is a pc just for MCE. I do not need it on hours at night every night sometimes lasting into the morning. MCE's taxi the HD and wear them out faster, I don't need Windows doing the same for senseless tasks that maybe only need to be rain weekly or monthly. I am trying to keep my energy bill down.