Sign-in to EMC using the Micros account, then Create a new account and give yourself a username and password. Log out of EMC and sign in with the new account you just created. Once you sign in for the first time, it should prompt you to create a new password. Once you've done that sign out again and back in with the new updated password.
On the Server, restart the Micros Portal, Micros Portal Information services and Micros NetVu Point Transformation service. This will update the username you just created. Once you have done this, try to log in to NetVu Point. If it fails again, give it about 30 minutes to an hour for micros itself to update (internally, can't speed it up), then try again.
Also, what browser are you running? I would suggest IE 7 or above (and under 11).