GH22LP20 & USB Enclosure Problems

hi i just bought a LG GH22LP20 Burner i have it connected to to my initio inic-1511 usb enclosure but whenever i connect it to my computer it comes up in XP as usb mass storage device and shows in My Computer as a removable disk instead of a dvd drive

the drive didnt come with a driver cd just a cd with burning programs on it

please help me get my burner recognized correctly

thank you