Hi, I have never built a computer before and have nothing that I can use so I have to start from scratch. My budget is $400 and that has to included a OS, preferably windows 7. I'm open to using open box or used parts but I don't want something destroying the rest of the the computer. This computer is going to be mainly for gaming, but nothing crazy, just something that will take me to something higher than 30fps on lowest settings in something like fallout which is what I'm getting now.I would also like to have some of the games like skyrim, or MW3 be playable at some point. I just need something that works O.K. to start, like 4gb of ram, a low end graphics card, but i want a good processor that will last a while because I don't want to buy a new OS just to upgrade the processor. So all I want to know really is if its possibly to build something for gaming on that budget, and upgrading along the way, please keep that in mind. I don't care if i have to go with Intel or AMD I just want the most bang for my buck with the processor especially. I just don't want really cheap or really old stuff if possible. Thanks for anything that you can tell me.