Applications mibehaving and getting "Not Responding"

[vivek shah]

hi,
    I installed Feisty Fawn on my laptop 2 days back and everythng
worked fine but strangely the various applicatins under
System->Administration do not respond when
I try clicking them to run them like Networking,Users and Groups and so on ...
The application launches asks for the password but then becomes "Not
Responding" for which I need to Force Quit.
What is the problem and what should I do???

Regards,
Vivek
-- 
Put a rogue in the limelight and he will act like an honest man.
                -- Napoleon Bonaparte, "Maxims"