Event ID 100 -error Bonjour Service

Task Scheduling Error: Continuously busy for more than a second
http://www.techmonkeys.co.uk/Thread-error-event-id-100-bonjour-service-solved
According to EventID.Net this problems is normally recorded in event viewer after a device such as a printer, iphone, ipod etc, closes it's connection with the PC abruptly. SO unplugging a device without it stopping it's service first.
SO nothing particular to worry about.
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This is a minor error produced by the Bonjour service, which is related to iTunes sharing.
[From Wikipedia: Bonjour is Apple's implementation of Zero configuration networking (Zeroconf), a group of technologies that includes service discovery, address assignment, and hostname resolution.]
MartyMyers (see comments) pointed out that this error is
"usually caused by removing QTTask and iTunesHelper from startup in registry (MSConfig). Removing/reinstalling itunes and quicktime will fix it."