Its not the same error, but thank you for replying. Its supposed to be a basic login system, enter username, password, click a login button or register as a new user. Upon clicking the login button with the method POST, it's supposed to connect to an access database, check to see if a user is even registered, if they are, check to see if the password is correct, if so, redirect to a secure home page. if the password is incorrect or the username doesn't exist, let the user know on the same login page, that the username or password were incorrect.
But for some reason, after all the attempts at using google to find an answer to this HTTP 405: Resource not allowed and making all the changes that I could find that were supposed to work, I still get the same error. I'd like to say that maybe PHP wasn't properly installed, but other php pages work as long as they don't have a post method when using the <form> tag. So if its not php, I know its more an IIS configuration thing for php, or maybe even something in the php.ini file that i've overlooked.