Bootcamp won't work after installing new partition

Hi. I've been using Bootcamp on my MacBook Pro 9,2. Everything runs great until I decided to create a new OS X partition on my HD. I searched all over the internet how to fix this, but none of the solutions that I found on the Apple Support Communities and other sites solved my problem. I tried deleting the new partition that I created, but the problem still persists. I was thinking of just deleting the Bootcamp partition as well and just install a new one. However, I want to see if it's possible to fix the problem without losing some of my data.