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Application popup: Winlogon generic control dialog: winlogon.exe - Application Error

Posted on 2005-04-21
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Last Modified: 2007-12-19
Having deployed the lastest security fixes on our test group, we have had several machines rebooting during the day with no indication. I assume, machines that had their screensaver activated received the message :

Application popup: Winlogon generic control dialog: winlogon.exe - Application Error : The instruction at "0x77f585c0" referenced memory at "0x00000001". The memory could not be "written".

when they clicked ok, the machine then bounced. Other instances, the machine has rebooted whilst the user was working. Any idea what could be going on? Nothing much in the event log to go by.
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Question by:Nookz
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Author Comment

by:Nookz
ID: 13833607
Please, note the reboot only happens once so far on each machine, and doesnt seem related to other issues discussed with Winlogon.exe.

Machines are XP SP1.

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Expert Comment

by:cpc2004
ID: 13834329
When Windows crashes with blue screen, it writes a system event 1001 and a minidump to the folder windows\minidump.

Check system event 1001 and it has the content of the blue screen
Control Panel -> Adminstrative Tools -> Event Viewer -> System -> Event 1001. Copy the content and paste it back here

If you do not find the system event 1001, the reboot is triggered by faulty hardware or virus reboot. Make sure your windows does not trojan or virus.
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Expert Comment

by:cpc2004
ID: 13834374
Do you want to find out why the system reboot or the appiication error at winlogon.exe?
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Author Comment

by:Nookz
ID: 13834436
need to find out why the machineS rebooted. Event ID 1001 is :

The SNMP Service has started successfully.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

We have up to date virus definitions, definately not a virus, and this has happened on various machines, so that rules out faulty hardware.

the machine does not blue screen, it reboots straight away (black screen) i.e. no dump.
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Expert Comment

by:cpc2004
ID: 13834612
Reboot without blue screen is usually hardware problem unless it is reboot wth reboot command which may be triggered by a new virus. Up to date virus defiition does not mean your windows does not new virus.
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Author Comment

by:Nookz
ID: 13841331
I've checked with Symantec, Sophos etc.. they have not seen this before, they do not think it is a virus that is causing it :S
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Expert Comment

by:cpc2004
ID: 13846494
I think it is hardware error

Run memtest to stress test the ram.  www.memtest86.com
or
Windows diagnostic http://oca.microsoft.com/en/windiag.asp
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Author Comment

by:Nookz
ID: 13856990
this has happened on over 15 machines, dont think all machines hardware failed at the same sort of time
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Accepted Solution

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cpc2004 earned 1000 total points
ID: 13903703
Attach the following files at any webspace. I will study your log and dumps.
C:\Documents and Settings\All Users\Documents\DrWatson\user.dmp
C:\Documents and Settings\All Users\Documents\DrWatson\drwtsn32.log
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Author Comment

by:Nookz
ID: 14017682
Microsoft advised to upgrade to SP2 to fix the issue!
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Expert Comment

by:cpc2004
ID: 14018749
Upgrade to SP2 is a standard reply from microsoft. Maybe the culprit is the anti-virus or firewall.  Btw what anti-virus and firewall utility are you using.  If you can attach the Dr Watson log here, maybe I can find out the culprit.
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