A browser basically does nothing but download files and render their contents. The web pages you go to are either html files or generated content that looks like an html file. In order for the browser to render the images on the page, it has to download GIF, JPEG, and other similarly encoded files.
There are products that you can use on a network gateway that can prevent access to files that meet certain criteria, but this requires a lot of work and sometimes additional expenses for equipment and software.
if you want to do this so that they cannot be accessed 'AFTER' you have visited them, you can clear your browsers cache and history. these are the records and actual information from the places you've been recently. in firefox, you can do this from 'tools' 'options' 'security' and there will be 'clear' buttons next to everything. i'm honestly not sure you can permanently delete ANYTHING with internet explorer.
dear friends,hello yesterday i want to download vlc-media player from internet and this download is still on showing message that one active download (1hourm9minutes remaining) .Actually iwant to stop this message from the screen, thanks