As I am in the market for a pc, I don't know where to start. I am computer illiterate and I am trying to weigh my options. What are some things I need to look for in a system? I don't need a computer that NASA would be envious of, but I'd like to have a system that would run smoothly. I saw some pcs at walmart that were called "gaming pcs" what do you guys think about their pcs?