After years of struggling with viruses and malware on her Dell, my relative is planning on getting a Macbook for use in her Barber Shop. In that shop, there are 3 other ladies using the computer for personal use (checking email, playing online games, weather, etc.), and this I think is what caused her old computer to slow down so much. With 4 unregulated users going to whatever webpages they wanted to downloading whatever they wanted to, things got bogged down quickly. The Mac, I think, will fix about 80% of these problems. However, I'm looking for other methods to help ensure this computer stays as fresh and speedy as possible after being used by 4 non-techie people who always seem to find a way to screw things up. What recommendations do you have on this front? Multiple user accounts which can be deleted and recreated occasionally? No cookies accepted in Safari? Some sort of limitations on downloads? What steps should I take in setting the computer up? Any suggestions would be most appreciated!