Oracle Bug 6596234 - Account is Locked - Enterprise Edition 11g

After i have installed Oracle in Vista 32-bit. I kept getting an error message Bug #6596234.

A Window appeared with this message:

This problem was caused by Oracle Enterprise Manager, which was created by Oracle Corporation.

Solution:

An update is available that solves the problem you reported. To get the update, call Oracle Corporation for assistance.

You will need to reference the following information when contacting Oracle Corporation:
Bug #6596234

1. What should i do?
2. I opened SQL*Plus and types username as "system", password as "manager". I get this message:

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

Please help, i'm novice so make your explanation easy to understand - if you don't mind

Thanks in advance

LVL 1
F-J-KAsked:
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F-J-KAuthor Commented:
I keep getting annoying window that says nmefwmi.exe...
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F-J-KAuthor Commented:
nmefwmi.exe stopped working and was closed
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AndytwCommented:
1. Looks like this is a common problem on Vista 32-bit running Oracle 11.1.0.6.0.  See the following thread:
http://forums.oracle.com/forums/thread.jspa?threadID=578076&start=30&tstart=0

2. The system account is locked (wrong password entered, or somebody explicitly locked it).  To resolve, connect using SQL*Plus:
SQLPLUS /@database as sysdba

then issue:
ALTER USER SYSTEM ACCOUNT UNLOCK;


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F-J-KAuthor Commented:
I uninstalled version 11g and downloaded version 10g, it works better.
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F-J-KAuthor Commented:
Thanks. Can you please explain what does ALTER USER SYSTEM ACCOUNT UNLOCK; mean?
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