"Help viewer cannot open this content"

In iPhoto '09 Help window I would get the following error message when I tried viewing any topic:
"Help viewer cannot open this content"
Problem solved with help from "Apple Expert" phone support following these steps:
1. reboot in safe mode - I think this clears system cache and runs a disk repair utility
2. reboot
3. delete ~/Library/Caches
4. empty trash
5. log out
6. log back in
7. empty trash
Apparently the problem was caused by a corrupt cached file.

This worked for me.
From http://www.thexlab.com/faqs/helpviewer.html#Anchor-Reset-35882
Quit Help Viewer if it is open. Leopard users should click the red Close button in the upper-left corner of the Help Viewer window. Users of Tiger and earlier can press the Command-Q (Quit) keyboard shortcut.
Trash the following three files in your Home > Library > Preferences folder, if extant:
* com.apple.help.plist
* com.apple.helpui.plist
* com.apple.helpviewer.plist
Trash the following two folders in your Home > Library > Caches folder, if extant:
1. com.apple.helpui folder
2. com.apple.helpdata
Empty the Trash.
Test that Help Viewer is now operating normally.
Sell Apple stock before the market gets wind of this.
Message was edited by: LazloG

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