I am guessing this is a home computer not a work computer. Is this the only setting that changes? If this is the only one i would agree with lhuser. It sounds weird though. Have you done any registry changes?
Change the world. Of one person. Today.
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.