Get "missing operating system" message when trying to access bootcamp

Get "missing operating system" message when trying to access bootcamp in win 7
i  have windows instaled about a year now.yesterday i tranfer 300 gb of  music in my laptop.today i open my mac hold alt on start up to sellect  opereting system,i found MacintosHD,recovery, and windows, and i select  the windows to boot,but says to me (missing operating system).i boot  again osx to see what hapend.osx is workin perfect.i tried to boot  windows again but the same msg (missing operating system).i have not  make any changes in my mac osx...!!!

Get "missing operating system" message when trying to access bootcamp in win 7
i  have windows instaled about a year now.yesterday i tranfer 300 gb of  music in my laptop.today i open my mac hold alt on start up to sellect  opereting system,i found MacintosHD,recovery, and windows, and i select  the windows to boot,but says to me (missing operating system).i boot  again osx to see what hapend.osx is workin perfect.i tried to boot  windows again but the same msg (missing operating system).i have not  make any changes in my mac osx...!!!

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