The following solution is temporarily , but let me know if it worked. Use 'baby powder.' Yes, Baby Powder.
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This tip was found from osh.com website and I credit them.
"Take the squeak out of floors (temporarily) by sprinkling a small amount of baby powder into the crevices along the edges. Squeaky floors are caused by two boards rubbing against each other or by a board rubbing on a subfloor nail. Baby powder decreases friction between the boards."
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http://osh.com/Cultures/en-US/Projects/OSHTips/Projec+OS H+Tips.htm
I will try to find a permanant solution. :)