ABit-NF7S what should i change first?

Since everything on that mother board is at least 3-4 generations old You would want to change everything...but you cant..sorry you can only use a 939 processor Not even the Athlon II.. it only takes up to DDR-333 possibly DDR-400 ram as compare to today's DDR3-1333 standard and OCed 2400...about the best OS you can use is XP..possibly XP pro...wouldn't even try the 64bit version. Yes that "product information"...better know as advertising hype, WAS correct IN ITS DAY...but WAY behind times now. It uses an AGP video card slot...there are no really high end AGP cards out there that could compete fairly with say a 5770 nor anywhere close to a GTX 480 That rig would never run today's top end games. That board was made in 2005! Abit is pretty much out of the PC mother board business for some time now.