[CentOS] Installing Centos Server Problems

Wed Jul 8 03:44:32 UTC 2015
michael wright <michael_j.w09 at hotmail.com>

 Hi  Can some one help me please. I am trying to install Centos 7.0 server but every time I install centos I keep loosing my windows 7 ? I have a 2TB Hard-Drive, Window 7 64 bit Operating System with Intel Core i5 2300 Processor when I reboot I loose windows and I have no dual-boot can anybody help me please this is the 7 time I have tried this and still fail 
Michael Wright