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you can set password as required by you...
open command prompt..
cmd>conn / as sysdba
sql>alter user system identified by password;
then you can use system user....
It is showing message as 'sql is not recognized as an internal or external command,operable program or batch file.
Pl post your exact OS details, along with the values of environment variables (use the "set" command in Windows and "env | sort" command in Unix) just before invoking sqlplus