I am using istat widget that lets you monitor your system. I noticed that after about 20 min my computer all of the sudden uses a lot of the CPU resources and warms up from 120F to 160F. Clickinig on the istat cpu monitor i see that something called rostertobrother.. using 99%. Looking at activity monitor i don't have that in there. I tried to look it up in finder and i don't have anything like that. Is this a virus? Can someone help?