THE STUDENT PILOT WAS REPOSITIONING THE HELICOPTER FOR TAKEOFF AFTER REFUELING ON A SOLO CROSS COUNTRY TRAINING FLIGHT. THE HELICOPTER TAIL ROTOR CONTACTED AND BECAME ENTANGLED IN AN AIRPORT WINDSOCK. THE PILOT WAS UNABLE TO MAINTAIN DIRECTIONAL CONTROL. THE MAIN AND TAIL ROTOR BLADES CONTACTED THE GROUND, THE LEFT SKID COLLAPSED, AND THE HELICOPTER CAME TO REST UPRIGHT.