BOOTMGR is missing

Hi !

i have Laptop - HP Pavillion dv4-1123us
originally i have received windows vista in this computer & i wanted to use windows 7 so i have formate my laptop & install windows 7 & from last 2 years that was working fine but somehow it stops to work and after starting my computer in five minutes suddenly blue screen with text - physical memory dump counting is come out & shut down my computer & today when i tried to formate & reinstall the system then it gives me one error...

BOOTMGR is missing
Press Ctrl+Alt+ Del to restart

Please help to resolve this.
 
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