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what's happening and how I can fix it? thanks.

hi everyone. since today, I have some issues loading some pages like twitter an 9gag. it doesn't load completely. only like 50% of the page. another pages it load fully, like facebook. I have this issue since I set my pc from w7 x32 to x64, today. I tried changing the servers but it doesn't work. I don't know what to do. any ideas?

pd: I'm premium user.