ubuntu software centre problem ! it does not work !

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http://www.ubuntux.org – I made a fresh installation of Ubuntu Koala 9.10 the Software centre does not work ! when I click the install button it doesn't install the application, it doesn't shows any error. it freezes without doing any thing. what should I do? I ticked the 2 basic repositories and I made a reload but it still the same ! Please help me ! It makes me crazy ! (Distributions)