Personal Computer Use Profile

I use my computer for school and personal use. The application that i like to use will be ITunes, Google and Facebook along with Yahoo. The type of equipment that i use will be my Ipod. The things that i will like to learn will be how to protect my computer so that i dont have to buy a new one when it gets a virus. I have went through two laptops in the past year. In my own time I like to buy music, play games on yahoo and get on facebook. I know a little about computer sofware but i will like to know more. I think the more you know about computers the more you can do to protect your computer. I know how to upgrade my computer but i would like to know how to add more memory to my desktop. Well my kids dont know alot about computers and my partner know more then me.