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upgraged windows 7 pro to windows 10 pro and now it won't load the OS

Last Modified: 2020-01-09
upgraded windows 7 pro to windows 10 pro.  All was installing fine and on the 2nd reboot it says "error loading operating system"

What do I try next.  Lenovo thinkcenter.  I backed up all files before this and created a system restore point.  What do I try now?
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