The New Fairfield Resident Trooper's Office is alerting residents to a Publishers Clearing House scam.   Letters have been circulating to residents claiming that they are a winner of the Free Lotto Association of North American lottery and provincial sweepstakes.  The letter says the winners are required by international Sweepstakes and the IRS to pay toward taxes and processing fees, and provided a contact phone number to make a payment.  But State Police say a real Publishers Clearing House letter will never say someone has won, as the Prize Patrol makes that notification in person, and will never ask for taxes or legal fees to be paid upfront.  Real sweepstakes will also never send a check and ask that some of the money be sent back.