Someone please help. NIS runs a daily scan, that I didn't schedule. How do I cancel it?

This scan runs daily between 7-8 pm. I have a scheduled scan that runs at 2 am, so as to not interfere with my work. I can’t find the 7-8 pm scan (which is really annoying, as I am always working when it starts) to cancel it. Any suggestions? This started back in February (I think) when I installed NIS 2011.