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I found the my.ini file and deleted all of the lines at the end that had illegal variables -
Not a good idea.
I suspect they are 'illegal variables' because the mysql database doesn't exist.
How did you install MySQL? Part of the install process copies the mysql database from a template in install folder to the data folder.
The error log says 'table msyql.user doesn't exist'. That's not a good sign.
The mysql.ini file should have an entry in it for datadir. That tells mysql (and you) where the database(s) should be located.
Does that datadir folder contain a 'mysql' folder?
If not copy the folder from C:\Program Files\MySQL\MySQL Server 5.7\data
Make sure permissions on the mysql\data folder allow user NETWORK SERVICE full control of the folder.
Now open Start | Run 'services.msc'
Find the mysql service in the list.
Start it.
Does it keep running?
If not, copy the newest block of entries, from the previous start attempt to the end of this start attempt.
Good luck,
Barry.