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    unable to connect sqlplus in windows 7

      E:\>set oracle_sid=orcl

      E:\>sqlplus 'nologs'
      SP2-1503: Unable to initialize Oracle call interfa
      SP2-0152: ORACLE may not be functioning properly

      hi i am installed oracle on windows machine and i am trying to connect through cmd prompt. But its throughing the above errors.

      Pls could u help me out on this and how can i connect to database.

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