Can someone PLEASE HELP ME with my ASUS Model T101H

So I needed to do an update and had to restart my computer so the update can be done and when it was done and my computer turned back on it went to a black screen and in the middle is a blue box that says Enter Password and right under that is where I am supposed to put in the password and I have no clue what it is so my computer wont even start now till I put in the correct password. Does any have a clue what it could be and or have had this problem before???? Please and help or suggestions will greatly appreciated.