So my iMac started bogging today, I have a memory geek let on my desktop showing my memories being maxed out. I Checked activity monitor and it shows a process called "AntiVirus" is using about half of my CPU, is this a virus? Or is this some process OSX has? I can restart my computer, and it will automatically use all my available ram, and continue chugging on my CPU. It say sits parent process is launchd_1 it's using about 130 mb of ram. Should I be concerned?