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Either your install is corrupt (eg missing files) or the Python environment is messed up.
The _OpenMayaUI module should be in
Python\Lib\site-packages\maya\api
The failures in the first screenshot (for mtoa and Arnold) are also because of Python.
Check if PYTHONPATH is set. If it is, unset it.
Do you have other versions of Python installed?
Get a Process Monitor log and check it, or ask someone to check it.
https://www.youtube.com/channel/UCoHypnYAvE7ffo9_a9fztjw
