I have a few questions about my white macbook that I don't understand. 1) In the applications menu, if I search "cache" a folder with a bunch of files show up labeled like 00, 01, 02, etc. appear. Can I delete all this stuff? I want to try to get rid of useless data. (if I click on one of the numbered folders, it leads me to a single files for each) 2) If I deleted a program by dragging it into the trash and emptying it, I assume it wasn't 100% deleted. How do I find those "left over" parts of the file? I'm generally curious, but at the same time I have a norton virus app that I deleted a long time ago that still "scans" a random times with certain files. 3) What do you suggest for getting rid of that "extra" useless data? Thanks!