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how to unlock system account??

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Hi friends,
please help me to solve this issue,

How can i unlock the system account?
when i am try to enter with sys account without passwords it shows the error :01031 :insufficient privileges.

i cant enter to sqlplus using system and sys account.

I can enter to sqlplus only with scott account. But I cant alter the system accont using scott account.

How do i resolve this issue??

command prompt window i am copied and pasted below . this will give u a correct picture:

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\WINDOWS>set oracle_sid=orcl


SQL*Plus: Release - Production on Thu Oct 11 20:25:46 2012

Copyright (c) 1982, 2006, Oracle. All Rights Reserved.

Enter user-name: sys as sysdba
Enter password:
ORA-01031: insufficient privileges

Enter user-name: system
Enter password:
ORA-28000: the account is locked

Enter user-name:

Thanks in advance......

Edited by: sreeprasad on Oct 11, 2012 8:02 AM
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