So safe mdcoe and "Last known good configuration" both dont work? Since you dont have a XP CD this isnt looking to hot. I honestly cant think of anyway to fix this. Being as it is a Macbook with boot camp it could be something to do with that or it could be that the XP installed crashed severely. With it being on a Macbook I cant say for sure what it is. Without a XP CD this makes it even tougher since you cant try a repair install or anything. You might be out of luck until you can get a CD.