Event ID - 21

Event Id21
SourceMicrosoft-Windows-PrintSpooler
DescriptionPrinter driver %1 was deleted. No user action is required. To stop logging warning events for the print spooler, in Control Panel, open Printers, right-click a blank area of the window, click Server Properties, click the Advanced tab, and then clear the Log spooler warning events check box.
Event Information According to Microsoft :

Cause :

This event is logged when the printer driver was deleted.

Resolution :

This is a normal condition. No further action is required.
Reference LinksEvent ID 21 from Source Microsoft-Windows-PrintSpooler

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