i want to upgrade my dell 2350 and i got 2 motherboards (from friends) they are both micro ATX(would they fit in my computer?) but one of them is SDR and the other is DDR so i'm completely lost. first of all , i don't know if my SDR memory would fit in the DDR slots, and, do i have to install windows xp again? , where do i start from?,im completely lost, i dont know where to begin from.Could some one told me where to find like a list of steps to install a motherboard? i dont wanna mess it up.