You can not have a hyphen or any extra characters in the file name if you want to seperate words you have to use an underscore _
Also you have linked to
http://www.kevincroxon36.com/http://.../about-us.html
It should be
http://www.kevincroxon36.com/about_us.html
Resave the page as about_us and correct the link as well as all your links.