Can't access some websites

I have this problem that i can't go to certain websites. im pretty sure that they are not down because i tested it on a another computer and it worked fine. I finally realized that it was my winsock that was causing the problem. But everytime i do the fix, it would work for a few minutes, then stop working. I tried everything: reinstalling the internet protocols, deleting the registry keys of winsock, and downloaded different winsock fixes. Help!!

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