Simply googling "YubiKey Windows" results in instructions for implementing Windows Login with the YubiKey (first result).
https://www.yubico.com/applications/com ... ows-login/ - instructions refer to another document for programming Challenge-Response in slot 2, which can currently be found here -
https://www.yubico.com/wp-content/uploa ... ration.pdf*Your Windows account must be LOCAL, not MICROSOFT (you can find this in Control Panel > User Accounts > User Accounts - under the account name it says what account type it is). Instructions for using a Local account instead of Microsoft account can be found here -
http://www.tenforums.com/tutorials/5374 ... -10-a.html*When programming the Challenge-Response credential,
DO NOT select require user input (button press), otherwise you will lock yourself out of your account.
*If you want to program your second YubiKey as a backup, once you finish programming the first YubiKey (page 8, step 9), simply remove the YubiKey, insert the second YubiKey, and click "Write Configuration" again.