I'm uprading my computer's mobo (am2 socket), processor (X2), gpu (nvidia 7 series), and memory (ddr2). At the moment my HDD's are new as well as my psu and case. So I guess I'm really starting from scratch. I can handle the hardware installation bit but the OS is what makes me stop and ask for help. I only have recovery disks now for XP which I know is tailored to my current system. Do I need to purchase an XP oem or retail version for my new build?