Your effort to make a mirror is blocked by the robots.txt of the website. 

The page <http://www.computerhope.com/robots.txt> has the following entry:  

User-agent: HTTrack
Disallow: /

You will have to tell HTTrack to ignore robots.txt rules to mirror the web
pages.   

Read more about robot.txt rules here:
<http://www.httrack.com/html/faq.html#Q1b1> and here
<http://en.wikipedia.org/wiki/Robots.txt>