I got this computer from a pawn shop. It had windows 7 64bit on it from factory, however someone took that off and put XP32bit on it. I would like to put windows 7 back on it. If I buy windows 7 will that come with all the drivers I need? it has NVIDIA geforce 6150 se nForce 430 graphics card in it. It works ok with xp, however I can not get a driver for the sm bus controller.