next, duplicate database. Please check:
sqlplus / as sysdba SQL*Plus: Release 10.2.0.1.0 - Production on MiÚ Abr 18 12:38:47 2012 Copyright (c) 1982, 2005, Oracle. All rights reserved. Conected to: Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production SQL> alter user sys identified by oracle; User altered. SQL> conn sys/oracle as sysdba Connected. SQL>
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sqlplus / as sysdba
sqlplus / as sysdbaif you get any error then copy past it here.