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.
Regards
Poorna

E:\>set oracle_home=E:\oracle\product\10.2.0\db_1
E:\>sqlplus /nolog
SP2-1503: Unable to initialize Oracle call interfa
SP2-0152: ORACLE may not be functioning properly
E:\>sqlplus /nolog
SP2-1503: Unable to initialize Oracle call interfa
SP2-0152: ORACLE may not be functioning prope
C:\Users\poorna chander>set oracle_home=E:\oracle\product\10.2.0\db_1
C:\Users\poorna chander>sqlplus /nolog
SP2-1503: Unable to initialize Oracle call interface
SP2-0152: ORACLE may not be functioning properly
i've done both the ways...but its not working.
Pls get me out of this.

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