The Windows network icon will explicitly state WPA on your router if you're using WZC to connect.
http://sfghdean.ucsf.edu/wireless/im...sf/wifig02.jpg < the AP on the bottom is secure, the AP at the top isn't. Make sure you don't use regular, dictionary, words for your passphrase too, a long (20 characters + ) mix of numbers and letters is probably best, pop it onto a text file using notepad and put that file onto a usb-key for ease of access.