Ok, answer me this then. What I would really like to do is change everything around. I would like to take a new case, mobo, proc, video card, and put it all together, then take the hard drive from my HP computer plug it in the new set up. Then push the power button and everything come on just like it was before but with updated parts. But, I have a strong feeling and after much research that this won't work. I think that I will have to buy a copy of windows xp to boot the system from, format the hard drive and start all over. I am not a tech head I read and research as much as I can before I do anything. I have the confidence to build a computer from scratch, but somethings I just can't find answers for. I would think you could just plug in the hard drive and it would work, but I don't want the unforseen circumstance that it will not boot and then I won't have a computer that works at all, and all my info will be lost. I hope I am not being too much a pain with this question. I am just fed up with this computer and its out dated hardware. I already have a case and psu just sitting here becasue I wanted to build a new computer and test my skills in this area, but I am poor atm, and can't afford everything I need. I can get a proc and mobo, going with am2 becasue they r cheaper but good quality. My current mobo doesn't even support ddr2 just ddr. So, what do yall think I should do. I cannot afford a whole new system OS costs way too much.