Event ID - 256

Event Id256
SourcePlugPlayManager
DescriptionTimed out sending notification of device interface change to window of "program or service name and/or GUID."
Event InformationThis Event ID indicates that an application that registered to receive Plug and Play device interface notification did not respond within 30 seconds of receiving a notification event. Applications can register to receive Plug and Play device interface notifications. After they are registered, applications receive notification events when an interface of the type they were interested in has been enabled/disabled for use by applications. This timeout is logged in the system event log. This Event ID is merely a warning that the application did not respond, and it can be ignored.
Reference Links Event ID 256 Appears in System Event Log

Event ID 256 is logged in the system event log after you install the MS04-011 security update on a Windows 2000-based computer

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