Bought a new CPU today, CD comes from Dell with both Vista (32 & 64-bit) as well as XP Pro 32 bit. I have Office 2003 Pro. This will not be a dedicated trading platform - which should I use... XP x86 or Vista x64? I see the upside of 64-bit vista as being RAM over 4GB but what about software and driver compatability? I'm leaning back to 4GB RAM with XP Pro 32bit (x86)... Any suggestions?