Hi, I'm new to the Mac environment. I used to run certain utilities on my PC for basic upkeep. Are there any applications for the Mac that you need to run once in a while to clear out old files, etc? Also.. I couldn't get a straightforward answer when I posed the question to the people at my local Mac store, should I have a virus protection program? If so, can you recommend one? I want to be sure that I am doing all that needs to be done to keep my Mac in running order. Any suggestions are welcome.