If the information in your credit report is wrong, the FTC, which enforces the FCRA, suggests you write to the credit reporting company as well as the information provider for the credit reporting company. The FTC has more information, as well as sample dispute letters, on the FTC consumer webpage.
As for old information, a credit report company typically cannot report on any negative information that is seven-years-old or older, or ten-years-old or older in the case of bankruptcies.