I left my computer running a disk defragmentation in Defraggler. This was the only thing that I had open. I left my home, and upon return, it was noticed that the orange light on my Logitech webcam was on. I have done nothing odd recently with this machine. The only other strange behavior that I've noted is that one of my searches in firefox went to yahoo instead of my default Google. I have no idea where to begin when it comes to removing this possible threat. Any help/advice would be greatly appreciated. Thank you.