error 404 problem in scrapebox

hey.
whenever i test proxies in scrapebox, i get the error 404 a lot of times, is it some type of settings tweek which i have to make to remove this error, i m running my scrapebox on my laptop which is i3, quad core 3gb ram and 2mb internet connection.

The web site hosting server will typically generate a "404 Not Found" web page when
a user attempts to follow a broken or dead link; hence the 404 error is one of the most
recognizable errors users can find on the web.[1