ehow is not a reputable source, and in this case, barely makes sense.
Here is a good article explaining how the registry works and why cleaning is pointless: http://lifehacker.com/5482701/whats-the-registry-should-i-clean-it-and-whats-the-point
Here is a good article explaining how the registry works and why cleaning is pointless: http://lifehacker.com/5482701/whats-the-registry-should-i-clean-it-and-whats-the-point