out of nowhere my computer started asking for a log on user and password but i never had one before, it would always boot up and go straight to my desktop...but now i cant sign in....does anybody know how i can bypass the log on screen and after that is done how i can make it so it dont ask for a log on username ans password.....i cant cancel it and or press Esc to get out of it...PLEASE HELP ASAP....THANKS!!!!!!!!!!!!