Hello All, this is my 1st post here. I have a problem and hope u can help me with. I installed win 7 ( 64 bit ) 3 times on my macbook pro. installation was successful each time and i managed to use win 7 normally, but later on after 1 or 2 days , whenever i select windows from the outside boot menu ( through ALT ) it proceeds away anyway to boot into mac os. after displaying a black page for seconds ( trying to boot into windows). Win 7 is there in the boot menu but it keeps booting into mac. this happened to me 3 times, each time i reinstall windows again successfully and same thing happens again within 1 or 2 days. it there any idea ?