Hi Guest, here is some info on how to straigten a guitar neck I have used this method on a stubborn neck and it worked wonders... Here also are the basics.
First, hold all strings down at the first and last frets, and see how far the strings are above the middle frets. If they are more than a couple of sheets of paper above, the truss rod needs to be tightened to make the neck more straight. If the strings are down on the frets in the middle of the neck, it is possible that the truss rod needs to be loosened, as the neck could be bowed upward.
If you find that your truss rod needs adjustment, and after you have removed all covers and found the correct wrench, gently tighten to correct downward bow, or gently loosen to correct upward bow. Do not apply force in doing this. If the nut or socket does not turn easily, you have a problem and need professional help.
Regards Fenderphil