Cannot Set Full System Scan and

After setting the Full System Scan to weekly and then clicking on  Apply, it doesn't take the change.  When I go back into Settings, it is set to Off.

 

Also, is there an option to select the day of week as well as the time of day for a Full System Scan?

 

And, I want to disable the Idle Scans.  I don't like the fact that I get a popup in the lower right hand corner of the screen almost every hour.  Is there a way to disable it?

 

Thanks in advance!