How to solve this ORA-12154 problem please?

Hello,
I'm trying to execute the following command:
C:\Documents and Settings\HP>sqlplus "sys/neo555@orcl as sysdba"
SQL*Plus: Release 10.1.0.4.2 - Production on Dom Dez 18 02:45:37 2005
Copyright (c) 1982, 2005, Oracle. All rights reserved.
ERROR:
ORA-12154: TNS:nÒo p¶de resolver o identificador de conexÒo especificado
Translating: ORA-12154 TNS could not solve the conection identifier specified
Informe o nome do usußrio:
Translating: Inform the user name:
How to solve this please because I get no other errors in the software.
Thank you,
André Luiz

Hi
If objective is to just connect as sysdba then you can simply check your SQLNET.ORA file under ORACLE_HOME\NETWORK\ADMIN and make an entry like
SQLNET.AUTHENTICATION_SERVICES = (NTS)
C:\Documents and Settings\HP>set oracle_sid=orcl
C:\Documents and Settings\HP>sqlplus "/ as sysdba"
Pls paste contents of your TNSNAMES.ORA and LISTENER.ORA files here.
Rgds
Adnan

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