Question : How do I get WPA-PSK added as an option on my network properties of my WinXP Pro laptop?

I have an older laptop I upgraded to WinXP pro almost 2 years ago.  I brought it out of the closet last weekend and tried set it up to connect to my wireless router.  When I when to add the WPA-PSK password, WPA-PSK was not listed.  

What do I have to do to get that option?

Thanks!

Answer : How do I get WPA-PSK added as an option on my network properties of my WinXP Pro laptop?

It also matters how you were trying to add the information.  if you use the wireless zero config you will need to do the following.
click properties on wireless network connection
add a prefered network
select wpa-psk on Network Authentication
If you are using the built in one (like aetheros, dell wireless utility, etc) then you need to make sure you are running their latest software.