Hi, I have a compaq presario cq56 and I'm looking to upgrade it. I got it for free from a friend and I had to replace the hard drive. The problem is its only running win7 32bit. I'm looking to upgrade the CPU and graphics. The CPU it currently has in it is an intel celeron 900. Can you tell me what I can use for a CPU that gets the most out of my machine? Also I would like to know how I could upgrade the graphics. Also will the new hard drive affect boot up or will I have to get a boot disk? (I ordered the hdd recently and haven't installed it yet)