My PC went through a lot of problems, one of the people i took it to didn't know what she was doing and just replaced things over and over. later i took it to a more credited man who got it to work but because the woman still had the CPU he bought a different one and put it in. well now i got the old CPU back and it is a Phenom II Black Edition the new CPU is a Athlon X2. so after getting the Phenom II i put in it expecting to see improvement. but now it seems that my games are running worse, for example in most of my games the Frame rate jerks around. Do i need to download drivers or something? or did i just downgrade my PC?