Computer crashes everytime I try to switch to windows

hi.

appreciate can offer.

installed windows 7 in bootcamp assistant. first few times, able switch , forth quickly. now, having issues switching windows, mac being snob ;0

anyway, must shut down (restarting not work). hold down option key more minute before see hard drives on gray screen. choose windows hard drive, , screen freezes. 2-3 minutes later, computer restarts on own, in mac.

please help?

 

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