Two questions on settings

I am a relatively new NIS user.

 

When I had the trial version, I don't think it scanned automatically, which is how I want it. I now have the regular version. It seems that every day it does a Quick Scan automatically. Is there a way to change some setting so that it does a scan say every 3-4 days or just NOT have it do a scan automatically (I can do it manually). hOW CAN i DO THIS?

 

Also, I have a computer with an external disk drive and another flash drive (USB) that I keep installed. When I do a scan, it scans all 3 drives. I just want to have it scan my "C" drive. It will do this if I just disconnect those peripherals. But, again, is there a setting so that every time I do a full system scan it will scan only the "C" drive.

 

Mel