You will need to run Aida32 or Belarc to see what your hardware is. Then go to the manufacturer's website and download the drivers. I suggest you burn them all to a CD so you will have them handy if you ever have to format again.
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If your equation requires either a complex combination of variables to get the desired result OR you can't seem to get the result regardless of the variables....it ain't your variables, it's your constant.