I have NIS 2012 latest.... I want to stop automatic Quick Scans

My computers get tied up with Quick scans when I don't want them so often.  I can not figure out how to stop these frequent Quick Scans.  This did not occur, scans only when requested occured, with NIS 2011. 

It is a pain to have to clear the popup that Scanning is completed.

 

Thanks in advance....  Fred