BIOS will search the first boot device to hand over its operations to the Operating System, if the operating system / MBR is not found then this error will happen - that's why your computer stalled at this specific part
Get into BIOS Setup, set to Defaults, save and exit if it boots OK, then go back in aad reset whatever differences you had i.e., number lock, also check the Boot Order and make sure your Hard Drive with Windows is the first boot device.
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