Hello people! I'm not quite sure if this is the right place to post, but it seemed half right, so don't bite my head off please. 
I've been gaming now for a few years on my PC and I've come to the point where I cannot stand it anymore. I've always managed to play the games I enjoy the most (Call of Duty 1 and 2) quite decent. Recently though, the lag (which I assume comes from my processor or graphics card) is becoming a joke and my DVD drive has stopped working, so I cannot install Call of Duty 2 after I uninstalled it ready for a re-install.
I've looked around your site for pre-built PC's, but everyone has told me that building one gets your more computer for your money. Me being me, I don't have a clue about PC's.. well a little bit, but not enough!
Now, my budget is something preferably around the £500/£600 mark. I'm going to need everything, although I do have a DVD drive here (not sure if it's working or not). I want the PC for gaming, not an over the top PC which is going to go over my budget, just something that will give me the maximum fps on the Call of Duty games and allow me to play some of the newer ones. I will also need an OS as the windows XP I have is running on this PC now. I'd like to point out aswell, I cannot use the case of this PC or anything else as for starters this PC should die in a hole (yes, it's that bad) and my brother/parents use this PC.
Just as a side note, I went to a little PC shop in the summer as I planned to buy from them when I needed a new PC. I was told that the i3 processor wasn't worth buying as a decent dual core was better and there is no need for a quad core processor as only the new games like crysis 2 require 4 cores. Is this true?
Thanks for any help at all
Jamie.

I've been gaming now for a few years on my PC and I've come to the point where I cannot stand it anymore. I've always managed to play the games I enjoy the most (Call of Duty 1 and 2) quite decent. Recently though, the lag (which I assume comes from my processor or graphics card) is becoming a joke and my DVD drive has stopped working, so I cannot install Call of Duty 2 after I uninstalled it ready for a re-install.
I've looked around your site for pre-built PC's, but everyone has told me that building one gets your more computer for your money. Me being me, I don't have a clue about PC's.. well a little bit, but not enough!
Now, my budget is something preferably around the £500/£600 mark. I'm going to need everything, although I do have a DVD drive here (not sure if it's working or not). I want the PC for gaming, not an over the top PC which is going to go over my budget, just something that will give me the maximum fps on the Call of Duty games and allow me to play some of the newer ones. I will also need an OS as the windows XP I have is running on this PC now. I'd like to point out aswell, I cannot use the case of this PC or anything else as for starters this PC should die in a hole (yes, it's that bad) and my brother/parents use this PC.
Just as a side note, I went to a little PC shop in the summer as I planned to buy from them when I needed a new PC. I was told that the i3 processor wasn't worth buying as a decent dual core was better and there is no need for a quad core processor as only the new games like crysis 2 require 4 cores. Is this true?
Thanks for any help at all

Jamie.