I have as custom built computer, with windows xp. My computer is supposed to have a 2.4GHz pentium 4 processor, but it has decreased to 1.7 GHz. I have no idea how this happened. I really don't want to pay 100 bucks just to get it checked, so if anyone acan help and tell me how to fix it I would be really thankful. I don't know what other info. you need but you can help me out on that