I have a Windows partition on my mac and before, I could use it normally, I could start the mac in Windows mode. Lately I cannot start my mac in windows, and when I look into the system preferences under the start up disk menu there is no more windows option. Yet the Windows partition is there on the hard drive, I can look into it, but the machine wouldn't boot in Windows. Anybody has an idea about what happened and how it can be cured?