Windows 7 Computer shut down itself

 I have a windows 7 64bit computer that shutdown itself and I thought it was strange. Because usually windows updates restarts the computer, not shutdown.
The computer was shut off at 6:38PM 7/15/2015 but here are some events leaving up to shutdown moment:
-The Windows Defender service entered the stopped state.
-The Superfetch service entered the stopped state.
- The operating system is shutting down at system time ?2015?-?07?-?15T22:38:48.820413000Z.
-The Windows Management Instrumentation service entered the stopped state.
The Remote Access Connection Manager service entered the stopped state.
- .... more events ending with "entered the stopped state "
The system time has changed to ?2015?-?07?-?15T22:38:41.426000000Z from ?2015?-?07?-?15T22:38:41.426560100Z.
- .... more events ending with "entered the stopped state "
The kernel power manager has initiated a shutdown transition.
-The process Explorer.EXE has initiated the shutdown of computer "USER" behalf of user Domain\User1 for the following reason: Other (Unplanned)
 Reason Code: 0x0
-The process C:\Windows\system32\winlogon.exe (TAMRA) has initiated the shutdown of computer  "USER"on behalf of user Domain\User1 for the following reason: No title for this reason could be found
-User Logoff Notification for Customer Experience Improvement Program
-DHCPv4 client service is stopped. ShutDown Flag value is 1

Is there a reason why this computer shut itself down?
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William FulksSystems Analyst & WebmasterCommented:
Could be you're having some kind of hardware failure. If you have a power supply tester, you may want to check it out. If not, try running any kind of built-in diagnostics that may be on the PC.

Another thing you can try is disabling automatic restarts:

    1. Right-click My Computer, and then click Properties.
    2. Click Advanced system settings.
    3. Click the Advanced tab.
    4. In theStartup and Recovery section, click Settings.
    5. Click to clear the Automatically restart check box.

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NVITEnd-user supportCommented:
Did this happen after a Windows Update?
Is domain\user1 you?
sgleeAuthor Commented:
The user used to complain about the noise coming from Power Supply or Fan.  But when I checked with the user just now, apparently the noise is gone now. But I will open up the box and check to see if all the fans are rotating.

Not sure if it happens after Windows updates. I would assume so because windows updates are done at night by default? domain\user1 is network account name of the user who is the owner of this computer.
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The following is certain :
- CEIP initiated a logoff
- A shell extension or CEIP triggered a shutdown on logoff.
- It's certain it is not an hardware or overheating failure. You would not have that log.

I would suggest you disable the various CEIP components:
- Opt out of CEIP in control panel
- Disable the CEIP related tasks in scheduler.
- Take a look with autoruns from sysinternals.
sgleeAuthor Commented:
In the Task Scheduler (Local) pane of the Task Scheduler dialog box, expand the Task Scheduler Library > Microsoft > Windows nodes and open the Application Experience folder, I disabled the AITAgent and ProgramDataUpdater tasks.
In the Task Scheduler Library > Microsoft > Windows node, open the Customer Experience Improvement Program folder, I disable the Consolidator, KernelCEIPTask, and Use CEIP tasks.
Well it doesn't explain the shutdown, which remain abnormal, but it should not happen anymore.
Still take a look with autoruns and use the virustotal option.
Don't just check whether the fans are rotating, but rather clean out all the dust, and try turning the fans with your fingers to check whether they turn freely and smoothly. Shutdowns often happen when systems overheat, and cleaning out the dust will help with ventilation.
It's definitely not a fan problem, in case of fan problem, you would get something along those line:
"The previous shutdown was due to Thermal Event (Overheating)"
"CPU 0 thermal throttling"
Cleaning fans is however never a bad idea when you know how to do it properly.
install speedfan - then monitor the temperature
If the PC just shuts down because it is too hot, there often is no time to log a message, it just turns off. Besides, sometimes the temperature sensors aren't active or inaccurate, and also then no message gets logged.

I've seen plenty of overheating PC's that just turned off, without BSOD or any message in the eventlog.
sgleeAuthor Commented:
I agree with your "If the PC just shuts down because it is too hot, there often is no time to log a message".
sgleeAuthor Commented:
I just checked the fans inside the computer - main PS, CPU fan and aux fan below main PS. They are all rotating.
I am going to close this case because it will take a long time to find out if the changes made (per ID: 40885118) would have solved the problem. I will just have to wait until "unintended" shutdown.

Thanks for your help.
there is no need to close the Q before you have the cause
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Windows 7

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