Authentication Issues?

I have a problem with my system and websites. For instance, I typed in the title above and clicked on the box to the right, to check if it had already posted...all I get is the time circle, it never loads.
This happens to most sites I visit. I also get the problem when I search for sites and the list is displayed, then if I click on the site I require it does not load, just the timer runs. I can get into my home page. It seems as if it stops me going to a sub page or downloading files. I did have the error or message operation terminated due to settings on your computer. I went through the list of default programs and that message no longer appears but I am still not able to download or view webpages.
It was ok but for some reason the gremlins have entered my system and all is not well now.

Has anyone had this trouble and how can I fix it please. Your support would be very much appreciated. :(

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