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Administrator account locks 10 minutes after any user log's off

Last Modified: 2013-12-04
I am running a windows 2003 Domain. I have some computers on my network (all running windows 2000) which will lock 10 minutes after a user has logged off.

It displays a message that says

"The Computer is in use and has been locked.
Only computername/administrator or and administrator can unlock this computer.
Press Ctrl-Alt-Del to unlock this computer"

When i press Ctrl-Alt_del it displays a blank username and password.

I've also looked in the evet veiwer and have only found one event that could be related to this is

"Application popup: Unlock Computer: winlogon.exe - Application Error : The instruction at "0x7c596e81" referenced memory at "0x00020048". The memory could not be "read".

Click on OK to terminate the program

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp."
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Distinguished Expert 2019

Turn on auditing on those computers to see who is claimed to be logged on.

I've seen this before. Try opening Regedit. Goto HKEY_Users\.Default\Control Panel\Desktop check the value for ScreenSaverIsSecure. If it is 1 then the screen saver is trying to lock but there is no one logged on.

If that's not it post back.


change ScreenSaverIsSecure to 0 (zero) if it is not already 0

Krompton :{


This will not work as it also happens after a reboot.

I have also removed the computer from the domain and deleted all the user profiles on it.
(sorry if i wasn't clear)


ScreenSaverIsSecure is already set to 0, however i have one called screensaveractive which is to 1
Have a look at http://support.microsoft.com/kb/242917

might help.

Good luck


I have just looked at this link and can confirm that both of these strings are as they should be but i am still getting this error.

It could still be a screensaver issue.
What are SCRNSAVE.EXE and ScreenSaveTimeOut set to? If ScreenSaveTimeOut is set to 600 (10 min) which is when you are noting the problem try changing it to 60 then rebooting. See if the timing changes.


I changed it to 60 seconds but its still taking 10 minutes for the computer to lock. Is there anywhere else in the registry where i can adjust the screen saver settings.

After a reboot can you get into the registry remotely? I say remotely because I want to check which SID Hives are loaded. Look in HKEY_Users and note the number. .Default, S-1-5-18, 19 & 20 are normal and one ending with a -500 is an administrator account.



I have noticed another issue which could be related to this one. I logged on to the computer then tried to change screen saver manually from the display properties. But every time I change it and apply it, it always reselects the option none.


I can only see the Default folder. The other ones are not appearing when the computers logged off.

That may be part of the problem. Those hives are basiclly your system accounts. You could try a restore if you have it enabled. but if you have already removed it from the domain you may just want to reinstall the os. if not you could also attempt a repair install.


I was just re-reading the posts and caught something I missed.

Is this happening with multiple machines? Are your clients all 2000 or mixed? If you are using Group Policy have there been any changes recently made?



All clients are using windows 2000. I also have group ploicy enabled on all of  them. The thing thats bugging me is that the computer i am using to test and try and fix this issue has been removed from the domain and yet the problem remains.
This one is on us!
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