eap-peap username/password problem

[kalesameer]

i have implemented eap-peap using freeradius-2.1.1. i am using windows XP 
machines as clients.
when users try to connect to server using the peap protocol,they are asked
for their username and password.
my problem is that once the users are connected to the server,they are not
asked for a username/password when they try to connect after logging out of
the network.the username/password that was used to connect to network
initially, is used automatically for subsequent purposes to connect to the
network.
is it a problem of the XP clients?or is the radius server caching all the
requests so that the next time no username/password is required?is there any
way so that the users are asked for a username/password every time they want
to connect after disconnecting(logging out)? 
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