problem in office 2011-outlook- for mac ( lion )

i have just installed office 2011 for mac ( lion ) and facing a unique problem, the outlook page opens for a day or so, i am able to get and send emails but after a while ( usually when i try to import my old data .pst - emails / contacts anything ) the outlook page disappears, it just shows the top bar and nothing else. 
i have tried reinstalling it thrice, but no use. same software working fine on a different machine. pls help as what can be the possible issue and how to rectify it 

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