ERROR: BOOTMGR is missing Press Ctrl+Alt+Del to restart, shows up when starting Windows.

I searched and found so many seemingly similar issues, but when i tried, i found that none was similar to my problem.
Actually, in my case, the setup doesn't detect the Hard Disk drive. So, neither do i have a preinstalled  windows, nor can i install, as obviously, i need a hard disk to install the windows on. then i found that the drivers that allows the laptop to communicate to the hard disk, have been wiped out.

I tried downloading the drivers, but could not find any, though i tried so many, but none of them worked.

So, please tell me from where can i download the drivers for my laptop? 
My laptop's hardware details are:-

Product name          : Dell Inspiron 5520

BIOS versoin            : A14

CPU type                 :Intel(R) Core(TM) i5-3210M CPU
Fixed HDD               : WDC WD5000BPVT-75HXZT3 (500GB)

Sata ODD                : HL- DT-ST DVD+-RWGT60N