Hmmm, I wonder why you use MySQL/MariaDB on Windows then, and not on a platform that you are more comfortable using and that is more commonly used for this application …
Please keep in mind that this is a community forum, not a paid support channel. Especially not if the topic is primarily about Windows administration tasks.
I’m not a Windows admin myself, but I guess that using the hints Andreas gave you already (“cscript”, “set”, “MK_CONFDIR”) and some Google, you should be able to run the mk_mysql.vbs script and see if it produces the expected output or perhaps some helpful error message. Perhaps there is some MySQL error.log (or messages visible in Event Viewer) that show if the login succeeds.