Technical, an important question here is - does the scheduled scan ever complete?
Well, today is Sunday, it's the only day I scheduled a scan...
It does not finish anytime and the CPU was used up to 95%.
Some questions:
1) Using an on-demmand scanning, the CPU usage (even when
not in background mode) is lower than the schedule task.

2) The schedule scan is taking much more time to finish than the on-demand with same settings even I'm not using the computer.
3) ashServ.exe is running like SYSTEM at
High priority :'(
4) Is the monitor and HDD power supply settings due to anything here? I mean, if the system go to stand by (if it is posible to a computer goes to this state while the scheduled tasks is running)
Seems that the scheduled action would ever posible to be started if it can't be finished
before the user comes back to use the computer.
I really suggest that the user can set the task priority.