How to fix 'BOOTMGR is missing Press Ctrl +Alt +Del to restart' error with Windows OS installation cd, that is using startup repair recovery tool.
Steps to do: Boot your computer from Windows 7 OS installation disc, after click Next go to 'Repair your computer' option, Select the operating system to repair, then use the startup repair recovery tool for attempting repairs. Finally restart your computer to complete the repairs.
Watch also, Root cause of boot manager is missing error from the link-
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