Unfortunately Dell does NOT activate PC/SC support for their contactless reader per default. But there is a very good article on how to enable it on:
https://ridrix.wordpress.com/2009/10/13/how-to-enable-pcsc-support-for-dell-contactless-reader/
Attention: Do you know that you can use your mobile as NFC Token to login to Windows? Read more here: https://www.win-logon.com/nfc-logon/