Why is my CPU speed lower

Users questions:My computer uses less than two years, there is always different problems recently, last week was all right, suddenly discovered this week reduced the rate of CPU, my CPU is AMD Sempron 2200 +, has now become a fast Long 900. My colleagues said it might be the time when bought with the computer's CPU overclocking tooOthers say the problem is the BIOS settings, expert advice, which in the end how the story ah?
Experts answer: first of the next CPU-Z software see next to your CPU, and see where the problem is, if the frequency of the CPU over a little way on, and two years, to get business is useless, can only be consideredBuy blocks of CPU. If the BIOS settings, then click on the settings into the BIOS, the CPU motherboard identification method to Auto on it. Or manually redeployed to FSB 166MHZ.
  • This information provided by the users.Thanks!