Windows boot camp wont start up

i switched to the windows os startup (my boot camp partition. Apparently the windows os isnt set up right and wont fully satrt...
So, is there a way to change back to the mac os as the start up disk without being in one of the environments--windows or mac?  i guess is the a way get myslef back to the mac osx   I know how to select it from control panel IF i were able to get into windows, but it doesnt boot!!

Power up your Mac while holding down the alt / option key. The grey screen appears with OSX / Windows menu. Choose OSX. When inside OSX go to Apple icon / System Preferences / Startup Disk / then choose to OSX as default ( or Windows - your choice)

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