Computer name changed. Need Help

Hello,
I noticed this earlier but was wondering why this may have happened and what can I do to change it back. On the login screen and also under "About this Mac" normally it would say John's Computer. But now it says John's Computer (2). And also Macintosh-2. Does anybody have an idea on why it is doing this? and how can i change it back.
Thanks

If there is a different computer on the LAN with the same name, one of the computers will change its name in that way. You can change it from the Sharing pane of System Preferences, but it cannot be set to the name of another machine on the LAN.
(32348)

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Dear Apple Friends,
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I found that sometimes the computer name had been changed ...
For example, from ABC to ABC (1). And if ABC (1) exists then the name changed to ABC (2).
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How to fix the computer name?

Here I also have an iMac that since installing Snow Leopard, approx. once a week, changes it's name to add a (2) at the end.
There is definitely no machine on the network that has the same name - but I can see that the mdnsresponder thinks so - and the duplicate appears to be my Time Capsule.
My suspicion is that this might be caused by the Bonjour Sleep Proxy functionality introduced with Snow Leopard, since for that, the iMac delegates it's identity to the Time Capsule to handle incoming requests while it's sleeping.
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15.10.09 15:33:56 mDNSResponder[17] mDNSCoreReceiveResponse: Received from FE80:0000:0000:0000:021C:42FF:FE00:0008:5353 1 Peter's\032iMac.net-assistant.udp.local. TXT
15.10.09 15:33:56 mDNSResponder[17] mDNSCoreReceiveResponse: Reseting to Probing: 25 Peter's\032iMac.net-assistant.udp.local. SRV 0 0 3283 Peters-iMac.local.
15.10.09 15:33:57 mDNSResponder[17] mDNSCoreReceiveResponse: Received from 192.168.1.162:5353 1 Peter's\032iMac.net-assistant.udp.local. TXT
15.10.09 15:33:57 mDNSResponder[17] mDNSCoreReceiveResponse: ProbeCount 2; will rename 25 Peter's\032iMac.net-assistant.udp.local. SRV 0 0 3283 Peters-iMac.local.
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We have about 200 computers that show their computer name as "MINWINPC". Doing an "ipconfig /all" shows the original computer name but doing a "net user" shows the computer name as "MINWINPC". In the control panel applet - the original computer shows but
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I know this is an old thread but a new patch is causing the same issue MS13-098. The only Microsoft submission I have found is in Japanese and is translated as follows:
Phenomenon
In Windows Server 2008 or Windows Vista, you might not be able to log an error appears to apply the new update the following programs, if you try to log on after the restart. • MS12-024 (KB2653956)
• MS13-098 (KB2893294)
Error message displayed is as follows.
Incorrect password or user name
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Collapse image Cause
This behavior occurs when you apply the update KB2653956 in the state of some data is damaged following registry key, or does not exist.
HKEY_LOCAL_MACHINE \ SCHEMA \ wcm :/ / Microsoft-Windows-CoreOS? ...
Any string will contain the part of the ... Note:. Also, make sure to load the SystemRoot% \ system32 \ SMI \ Store \ Machine \ SCHEMA.DAT file% if the HKEY_LOCAL_MACHINE \ SCHEMA does not exist.
When you apply the update of KB2653956 in the state where the registry key is not present, the value of the following registry is changed to MINWINPC, logon will not be able to.
• HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ ComputerName \ ActiveComputerName
• HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ ComputerName \ ComputerName
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Collapse image Solution
If this occurs, change to the correct computer name the value of the ComputerName registry and ActiveComputerName start in safe mode, has been mentioned above, and then restart.
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Collapse image Workaround
To prevent this phenomenon occurs, you download and run the System Update Readiness Tool from the following KB.
http://support.microsoft.com/kb/947821
By performing the system update Preparation tool registry that is described in Section Symptoms are repaired.
If the repair is made, starting with log Recreated missing key as the following WinDir% \ Logs \ CBS \ CheckSUR.log file% is recorded.
Recreated missing key:? Wcm :/ / Microsoft-Windows-CoreOS ... \ metadata \ elements \ ComputerName
In addition, regardless of the presence or absence of entry damaged Microsoft-Windows-CoreOS, you can set the value of the ComputerName key in this tool. For this reason, the following log is recorded in the CheckSUR.log.
Recreated value: @ _type.
Recreated value: @ dataOnly.
Recreated value: @ default.
Recreated value: @ description.
Recreated value: @ displayName.
Recreated value: @ handler.
Recreated value: @ legacyName.
Recreated value: @ legacyType.
Recreated value: @ migrate.
Recreated value: @ scope.
Recreated value: @ xsd: type.
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Note: This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. It contains information in response to emerging issues are listed. As a result of the speed of information provided may be typographical
errors are included in the article, you might be revised at any time without prior notice. For other considerations, and use conditions
Please refer to.
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Collapse image Property
December 11, 2013 - Revision: - Last Review: 2901584: 4.0 Document Number
This document that was written about products for.
• Windows Vista Business
• Windows Vista Business 64-bit edition
• Windows Vista Enterprise
• Windows Vista Enterprise 64-bit edition
• Windows Vista Home Basic
• Windows Vista Home Basic 64-bit edition
• Windows Vista Home Premium
• Windows Vista Home Premium 64-bit edition
• Windows Vista Starter
• Windows Vista Ultimate
• Windows Vista Ultimate 64-bit edition
• Windows Server 2008 Datacenter
• Windows Server 2008 Datacenter without Hyper-V
• Windows Server 2008 Enterprise
• Windows Server 2008 Enterprise without Hyper-V
• Windows Server 2008 for Itanium-Based Systems
• Windows Server 2008 Foundation
• Windows Server 2008 Standard
• Windows Server 2008 Standard without Hyper-V
• Windows Web Server 2008
• Windows HPC Server 2008
• Windows Essential Business Server 2008
Hopefully Microsoft will get this on the MS13-098 Bulletin immediately which they are always slow doing.

Computer name changes after security update

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