Historial para "Replaced my hard disk drive"

I had to replace my hard drive that was a seagate SSD 256GB.  The new SSD is raw, no operating system, (My old drive was running Windows 7).  I do not have recovery disk or the Windows 7 disk,  How do I get windows and install it on my new drive,  When I turn the lap top on it's looking for the "Bootmgr".

Dispositivo:

Lenovo B575-1450

Estatus:

open