Word 2008/Mac OS X 10.4 Plugin Installation Problems

Mac OS X 10.4 (Tiger)
Word 2008
I can't get the plugin to work: nothing appears in the Word script menu. When I click on 'preferences' the MacWord Integration 3.0a2 add-on in Firefox I get 'Reinstall Word components' followed by 'neither Word 2004 nor 2008 appear to be installed on this computer. Please install word and then try again.'

Any suggestions?

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