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

mkramer777 used Ask the Experts™
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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I do have a startup interrupt menu.  I can go into bios setup, f10 diagnose hardware, f11 to recover your system, f12 to choose a temp startup device
Kesavan JeganarayananIT Consultant

Could you try this link to download windows ISO file while running the tool. can use 8GB usb drive to burn the ISO using ISO2Disk free software.

Use this USB to update windows.
The ISO usb drive was still plugged into the computer after the initial install.  Computer trying to boot to usb drive.  Unplugged it and all is well.

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