Forum:I just bought Dragon Valley and it wont work

so i have Supernatural, but my sister just took it with her to college. okay, so be it. i did a little research and since it was the most up-to-date version of the game that i had, i couldn't play the game without the disk. so i just purchased a new one, Dragon Valley, and installed it minutes ago. it still says i need the Supernatural disk. i'm a little frustrated and confused, anyone care to help me out? <3