In windows 8 after shutting down the computer, the Sign-in Options that allow you to switch between PIN or Password is missing. I am using a PIN code however now it is currently stuck on Password making me unable to sign-in. How do I make the Sign-In Options appear again ??

Kindly go through the following thread:

https://social.technet.microsoft.com/Forums/en-US/4d026aeb-abea-42f6-b67c-51a3db2e06e9/windows-8-signin-options-missing?forum=w8itprosecurity

You may also go through:

How to refresh, reset, or restore your PC

Windows Startup Settings (including safe mode)