10.5.3.0 help file displays html instead of content

I upgraded my laptop to 10.5.3.0 and now when I open DO help it displays the content in HTML. None of my other applications do this.

I'm running 64-bit Win7 Home Premium with SP1.

Any ideas how I can fix this?

Thanks!

Please see: FAQs / Help file does not display correctly

Thank you! And sorry that I missed the FAQ. I thought I had browsed and searched pretty thoroughly.