The file became unreadable due to a system crash or sudden power loss.
If your PC came with Windows 7 preinstalled, the manufacturer (Dell, HP, Lenovo, etc.) typically provides a recovery partition or recovery discs that can repair boot issues. windows 7 bootmgr download
BOOTMGR must perfectly match your specific Windows 7 build, architecture (32-bit vs. 64-bit), and service pack. A mismatched file will still cause a boot failure. The file became unreadable due to a system
Sometimes BOOTMGR isn't actually missing—your computer is just looking for it in the wrong place. the manufacturer (Dell
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Misconfiguration, sudden power outages, or malware have damaged the boot sector.
(If you are using a Windows 7 USB drive, the path may be something like E:\bootmgr .)