Why is my text messed up in Firefox 3.5 in Windows 7? (see pic) How can I fix this?

It only happens on some web pages, and only开发者_StackOverflow中文版 for some text items. On splurb.com, it is happening all over:

http://scottelkin.com/images/splurb.jpg

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Going to splurb.com it looks like the font used is in the family of Helvetica,Arial,sans-serif(lifted from the css). Those fonts should be included into windows. Perhaps they have been removed. Make sure those fonts are installed.