Hey, I'm new to the fourms and I need help with my macbook. I have a copy of Windows 7 for my mac and when I installed it it forced shut downed immediately! I boot it up by pressing option and chose the windows partition and it is a black screen with a flashing underscore that blinks once, then rapidly blinks until It shuts it off. I have read every fourm and they say nothing about booting up problems. I need help because I have a bunch of products that are windows only programs and need to be finished by Friday. Thanks (My specs are below): Macbook Mid 2009 Snow Leopard 10.6.4 2 GHz Intel Core 2 Duo 2 GB 667 MHz DDR2 SDRAM Macintosh HD (Start up disk) 500 GB Western Digital Hard Drive The rest is on the apple website. Thanks!