BOOTMGR IS MISSING(100% Fix it Now)
Don't forget to Press F8 key when windows Restart, after it Open with Safe mode.
If F8 key not works then try with Windows Repair disk.
You can fix BOOTMGR Missing with the Help of Startup and Repair.
Try it.
If confusion Then comment I'll try to solve Out. - !-
there is also other option to Fix BOOTMGR by using CMD,but this one is easiest.
For other option click on command prompt option in advanced recovery mode
and search for system reserved partition(where is all booting file available.
copy bootMGR from from other source(like copy and past BOOTMGR in pendrive from other computer)and paste into
a system reserved partition location.