I am working on a Dell Inspiron E1505 and I was checking out the specs and it appears to be 64bit but I'm not 100% sure. I want to maybe install a 64bit windows, but I don't know if the 'processor address bus width' must also be 64bit. Here are the specs: System chip set: Intel 945 GM or Intel 945 PM Data bus width: 64 bits DRAM bus width: dual-channel (2) 64-bit buses Processor address bus width: 32 bits Graphics bus: PCI-E X16 PCI bus: 32 bits Is this good to go for Windows XP x64? What exactly is the "Processor address bus" as opposed to the "Data bus"? or, Which data utilizes the "Processor address bus"?