Freeradius, wireless access point and password authentication

[Roberto]

Hello, I'm new to freeradius...
I want to realize a sort of hot spot using freeradius, mysql (with a 
graphical interface creating users on it) and some access points 
(linksys, d-link, etc...).
I correctly installed and integrated freeradius and mysql. Now the 
problem is to use the access points as NASes, and to realize an 
authentication system which prompts the client computers ( with Windows 
XP ) for a password in order to associate with the AP. I cannot use 
certificates to join the AP, because the client computers belongs to 
occasional visitors, and installing certificates on each client would be 
little practical. I made different trials, with no success.
Thank you in advance for any help, and sorry for my bad english.... :-)