I am running a MacBook with OSX and Windows 7 dual booted. Up until now I have been able to freely switch from each operating system. Last night I shut down my MacBook, and then tried to turn it on today and it gets stuck on the Apple loading screen. But if I hold option key then I can boot into Windows and I do have MacDrive installed and I can access the drive but it says that the drive is corrupted or unreadable. I have made no configuration changes. When I am holding down the option key also I seen EFI boot, and .Windows. Please can anyone help me?