How do you repair a hard drive containing a Windows 7 Professional x64 install to be bootable on its own from within another W7 Pro x64 environment? As explained below, I caot boot into most (Windows-based) recovery environments while the disk is plugged in, so the usual methods won't work. After having some computer issues (still ongoing) I installed Windows on a fresh hard drive. After a while I needed to boot into my previous Windows installation, but having it as a secondary disk and booting to the new disk broke the bootloader ("Bootmgr is missing, press Ctrl+Alt+Del to restart"). I swapped drives around until it fixed itself, but the Windows logo was taking much longer than it usually ...
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