I have a MAC book with a boot camp installed. My secondary OS is windows xp and lately i cannot boot to my MAC os. When I turn on my computer it displays a folder icon with a question mark on it and then it boots to my windows xp. How can I get back to my MAC os and I really need to get rid of the windows os? I tried to use the 'alt' key to choose where to boot, but still same thing happens. note: I was running my mac with windows xp for about 3 years now. Thanks.