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Event ID: 18 Source: WindowsUpdateAgent

Installation Ready: The following updates are downloaded and ready for installation. This computer is currently scheduled to install these updates on <date> at <time>: <updates>.
This event alone just notifies you that one or more updates are downloaded and ready to be installed. If the event is appearing repeatedly for the same update, this may indicate that that update is failing to install for a reason that you will need to investigate.

Several users reported that on a Windows XP SP2 system this problem was caused by a missing registry key. The key reported by the users is "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\SensLogn". You could try to import this key, to see if the problem is fixed. Be sure to make a backup prior to trying this, and note that changing the registry can always cause trouble, so do this at your own risk. The following is the contents of the key from a Windows XP SP2 system.

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\SensLogn]

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