How to turn off disk optimizer

NIS v 6.3.0.14

 

I have this software via my Comcast account.  I do NOT want the optimizer function - I use Diskeeper, and the two apps have different approaches to defragging, whereby one re-does what the other did... and both are on auto-pilot.

 

So, I want to turn off that Norton defragging function -- as well as the registry cleaner.  Oddly, disk optimization is already un-checked in the task scheduling window, but the operation is still being done...(??)

 

Thanks in advance!