Everybody's a newbie at some time, and most who aren't computer geeks will stay computer illiterate.
First, as a side note, Dells aren't great. They can have some odd little bugs that screw things up. If you are looking to play games, Dells are horrible. For everyday wordprocessing and whatnot, they are capable but run-of-the-mill, and, like I said, a bit odd. That's not to say they are horrible. It's just wiser to buy from a different company in the future, or, if you have a technical friend, throw some cash at him and he can build you something suitable for what you want to do.
Anyway, sorry about that little rant.
First, do you have an included CD for the PC? It may have much needed drivers on it.
Next, I'm going to need more information to help you. I need the name of your graphics card, or if you don't have one, your motherboard. To find your graphics card, run 'dxdiag.exe' and open the graphics tab at the top of the window. If you don't know where that is, just run a search for it.
The motherboard is harder to find, so we'll leave that for now.
