Are you using Bootcamp assistant to install Windows?

i have the same problem

i use Bootcamp assistant to install Windows

which is the final solve?

If the Windows Installer starts, but fails,

1. Are you selecting EFI Boot from the Apple Boot Manager?

2. Are you using a USB Installer or a CD/DVD installer?

i using a usb thumb drive installer

Did you have to modify Bootcamp Inof.plist to see the USB Installer option?

Your USB device needs to be a USB2 device. Here is an example.

i modified the Bootcamp info.plist file

and i used a usb2 thumbdrive

Is your built-in Optical drive not functioning properly?

i have changed with a hdd because my optical drive is not working

Now my Macbook pro (Erly 2011) have two Disks . 1) SSD 2) HDD

Please see Can't install windows 8.1 on early 2011 MBP which has steps for your specific case.

Which believe is the best and easiest option for me?

i want each disk have separate OS (ssd runs Mac os and hdd runs windows)

Thanks for your support

Install Windows first, and then install OSX on the SSD.

the installation of windows should done on hdd in the manufacture place or i leave it in the optibay?

In the manufacturer place (main bay).