I have a Dell Optiplex 760 purchased in June 2009. Processor is an Intel Core 2 Duo E8500 running at 3.16 Ghz. I am currently running XP Professional, but want to upgrade to Windows 7 Professional (or Ultimate) 64 Bit. Will this PC run the 64 bit version of Windows 7 ? My main aim is increase the amount of RAM that I can effectively use. Appreciate any advice given.