I've installed Security Essentials, and changed the automatic scan from Sunday at 2:00 AM to 2:00 PM because I know the computer will always be ON at that time. What I'm not seeing is any info about the definition updates. I assume they should be downloaded daily. Is this process "automatic"? Is it scheduled? If so, how? Specifically, regarding both updates and auto scans, does someone have to be logged on at the time or is it only necessary that the computer be on, and connected to the Internet?