Dvd-R To Dvd+R

  Ihave used a sony vcr\ dvd recorder to put vhs family videos xmas easter etc.  the problem is it copys to -r my hp xp pc only reads and writes + rs i want to make xtra copys for family  i purcashed a external Hp 80E multi format writer reads writes all can i change my -rs to the+rs    and how thank you Pat