Darren Helm continued his marvelous comeback from a string of injuries Friday, burning the Islanders twice with his speed to help deliver a 5-0 road win for the Red Wings. With Jimmy Howard returning to the net and providing strong goaltending, especially when the Wings were out-shot significantly in the first period, they won their eighth road game against three losses in regulation and one in overtime. Howard earned the shutout, making it 18 for his career. It was his first win since Nov. 1. “I can’t really say I changed much,” Howard said. “It’s just hitting the reset button.” Daniel Alfredsson, in his 1,200th game, scored the third and fifth goals for the Red Wings, his fifth and sixth of the season. “I think we are giving ourselves a chance,” Alfredsson said, summing it up. “We are scoring goals. At the same time, we are playing well defensively.” Alfredsson’s first goal came on a long, thread-the-needle pass from Brendan Smith, who had two assists along with 20:56 of ice time, second among Red Wings defensemen. Gustav Nyquist scored the Wings’ fourth goal, his third in five games since he was called up from Grand Rapids. But Helm provided the big spark. After injury-riddled seasons, perhaps no player deserves good fortune more than the 26-year-old Helm, who now has seven of his 38 career goals in 13 games, after missing 75 games to injuries the past three seasons.