Hello I am aiming to upgrade my computer. I have a windows xp SP2. My CPU is a Intel(R) Pentium(R) 4 CPU 2.66GHz, My current ram or so it says is 224. I am wanting to go to 1 gig. I would like to know if i can do this and if i can. How do i know what to get. Do I want DDR or what I am really confused on this whole matter. Thanks in advance.