Can not access the public schema

Hi,
I had installed postgresql-8.1.9, But when I tried to run any sql statement like the following:
(1)select * from <TableName>;
or
(2)select * from public.<TableName>;

on the query tool to access any table inside the public schema I got the following error:
ERROR: relation "<TableName>" does not exist
or
ERROR: relation "public.<TableName>" does not exist
thought I am logging in with a superuser account.

-Please advice.

Thanks,
Mohamed.

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