Can't boot my bootcamp

I've been using windows in my mac for around 2 years, and just earlier when i wanted to use it, it shows a black screen with the message of no bootable disk found. Recently, my mac went through an issue of booting to recovery, so the apple store just kept clicking repair permissions and voila, my mac was fixed. How can make it bootable again? Do i have to back it up and reinstall bootcamp?