Currently running 32 bit Vista but have purchased extra RAM so that I can utilise my 64 bit discs and 4 gig RAM, however, in the near future I will be upgrading my dual core cpu to a quad core. I know that when I upgrade my motherboard that I need to reformat and do a fresh install of Vista 64bit but does the same go for the CPU? In other words if I leave my old cpu in place then upgrade to 64 bit Vista would I have to reinstall 64 bit once the new processor arrives?