Lyx 1.6.6.1 on Windows - Help broken

[buchs]

I have just installed 1.6.6.1 on Windows XP.  I found that the Help menu
options are mostly broken.  Nothing happens when I select Introduction,
Tutorial, etc. except on the bottom status line it displays the command.  I
did a full install including MikTeX.  Is this a familiar problem or just me? 
Any suggestions?
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