since you have a windows installation usb ready now, you can try this:
Boot your computer from a Windows installation media > repair > command prompt (again)
run the commands below one after the other (hit Enter on each line) to replace the
utilman.exe file with the cmd.exe file.
^if C is not where %systemdrive%\Windows is located, then D: or whatever your Windows installation is on (per your post above)
Code:
ren c:\windows\system32\utilman.exe c:\windows\system32\utilman.exe.bak
Code:
copy c:\windows\system32\cmd.exe c:\windows\system32\utilman.exe
boot back to windows logon screen and let me know when there