> i have tried to download w3schools.com on various systems 
> but unable to do that.
> ..
> robots.txt rules, links begining with these path will be 
> 
forbidden: /quiztest, /banners, /images, /ado/demo_db_edit.a
> sp, /html/tryit.asp, /css/tryit.asp (see in the options 
to 
> disable this)

There are remote robots.txt rules that prevent you from 
downloading the site. If you disable them, please use lower 
bandwidth settings first (2 connections, and a maximum of 
5000B/s is pretty reasonnable for slow sites)