Fail to install Windows7

My MacBook Pro (15-inch, Late 2011), since start 3 days ago i keep trying to install Windows7 with original apps Boot Camp Assistant on El Capitan, it start without any problem. Once the installtion after create partition and restart to start install Windows7 from booting my DVD Drive. I using original Windows7's DVD, but is just can't start load windows's file and start install. It just left a blank black screen and a underscore symbol on top left of my screen. I keep trying and trying many ways to install dual boot on my Macbook Pro, i try many solution before like those using USB Bootable, third-party apps like VmWare Fusion, all i get is fail result. 2 Months ago i still can get boot into Windows7, after that i didn't turn on my machine for 1weeks, now it just show me a underscore symbol on top left of my screen. Can any one help and tell me is that my hardware failure or my software problem. I really need Dual boot on this machine for some work.

Ps: Please forgive my poor english.