try this address for the demo disk. i would click other illness and say the game hung/froze. good luck! http://www.futurenetworkusa.com/publications/oxm-discreplacement.html
i just got my 1st issue of official xbox mag and inside it said if the disk was faulty you could order a replacement. . . (page 14 of november issue.) it says contact by email so you could just say you picked up your copy at kmart. it should work!