Get your free credit report at http://www.annualcreditreport.com
File a dispute with Equifax at https://www.ai.equifax.com/CreditInvestigation/home/getStarted.jsp
File a dispute with TransUnion at http://www.transunion.com/personal-credit/credit-disputes/credit-disputes.page
File a dispute with Experian at http://www.experian.com/disputes/main.html