The error message “BOOTMGR is Missing” indicates that your system cannot locate the Windows Boot Manager. This critical ...
On Windows 10, you can use the DISM command tool to repair the local image, which you can use with the System File Checker ...
EDIT: It did - changing that setting back to "AHCI" resulted in a, "This operating system failed to start", message when I tried to boot XP. Changing the BIOS back to the "IDE" setting didn't fix that ...
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