Mac Help disappeared - how to re-install just this

Mac Help has disappeared from our i Book. How can we re-install just the "Help" and not risk losing or corrupting everything on the hard drive?
Thank you.

Hi D44,
first try this: FIXED: Help Viewer crashes or shows blank window.
If this does not work, reinstall Help Viewer from the Mac OS X Update 10.4.8 Combo PPC using Pacifist. Help Viewer is located in the installer package at System/Library/Core Services.
If this answered your question please consider granting some stars: Why reward points?

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