Windows Login Smart Card

I run a number of laptops running windows XP Pro.  At the login screen I have the option to either enter a password via CTRL-ALT-DELETE or insert a card.  I am interesting in the card option for security concerns.  Can someone please advise me of what options there are.  I am not looking for something terribly complex.  My goal here is to protect the machines pending they were stolen or fell into the wrong hands.  

Thank you.  
kokeefeAsked:
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