Daniel,

I need you to check a couple things. First, make sure the brake pedal has enough play that it is not pressuring the system. Second, check the park brake lever or levers at the drive axle and make sure they move when releasing the park brake. If they do not, the park brake is engaged when you are trying to move. To make sure this is the problem. Release the park brake and try to move the lever using a pry bar. If it moves lever was rusted in the applied position. Good Luck