Hello tome2b
Can you please follow the steps in the second section of
this tutorial to boot Windows to Command Prompt externally?
Once in the command window, you can either type the
BCDEDIT /SET {DEFAULT} BOOTMENUPOLICY LEGACY to enable the
Advanced Boot Options menu (that you can access by repeatedly pressing the F8 key during the computer startup) or type the
SFC /SCANNOW /OFFBOOTDIR=D:\ /OFFWINDIR=D:\WINDOWS command (assuming that Windows 10 is installed on the
C:\ drive) to automatically fix the issue?
Feel free to report back if further assistance is needed.
Cheers!!