I had been getting ridiculous CPU usage - a variety of processes were eating up 100% of my CPU cycles and my computer was always chugging. My google-fu led me to uninstall Trend Micro 2007, and the problem went away. This is a well-documented problem, and I wanted to share it with everyone in case they were going through similar problems. It wasn't even that the TM client-related processes were causing the usage. Sometimes it was firefox, etc. that showed up for the overuse. However, this stopped completely once TM got removed.