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BOOTMGR is Missing: Fix for Windows Vista, 7, 8, 8.1, 10
Fixing Bootmgr is missing error in Windows - gHacks Tech News
Methods to Fix BOOTMGR is Missing Error in Windows 10/8/7 - Data Repair Tools Article
SIRIS, ALTO, and NAS: Boot error, "The operating system couldn't be loaded because the digital signature of a file couldn't be verified," after system restore