To set the default operating system in Windows:
1 In Windows, click the Boot Camp system tray item and choose Boot Camp Control
Panel.
2 Select the startup disk with the operating system you want to use by default.
3 If you want to start up that operating system now, click Restart.
and you can always hold down the alt/option key when it starts up to select operating system and then it will continually boot into the operating system that is selected.
and you can always hold down the alt/option key when it starts up to select operating system and then it will continually boot into the operating system that is selected.
Actually no, sorry! The option key only affects the current boot cycle and does not change the default boot drive. That is why it is great for those who just go into Windows occasionally and prefer that the default drive remain OSX (as I do).
Going into the Startup Drive pane of in the System Preferences on OSX and choosing a drive there will make it the default however.