Were you talking about the system you already have or the new computer you are going to purchase for your son.
If you were talking about the dell, then it won't. It has intel celeron. Celeron is a very cheap processor. Celerons were designed for people with low budgets and was not made for gaming. How much are you willing to spend and what parts do you already have that you won't need new ones (such as a mouse, keyboard, speakers, monitors etc.)
If you were talking about the one you currently own, what processor does it have?? If you don't know, go to my computer, then at the top left, it will say view system information. Then a window will pop up saying some general information about your computer.
If it is a ball mouse, I'd highly reccommend an optical mouse. They are much easier to use and lighter.