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The problem might be caused by your router. Have you tried restarting it? If not, please do so and when you have done this, reboot Windows too.
If you still have a problem, click on the Start button and type cmd.exe in the Search Programs and Files box. Rightclick on it and choose "Run as Administrator". Copy and paste the below commands after the prompt> and hit enter after each line.
ipconfig /flushdns
ipconfig /release
ipconfig /renew
Close the command prompt and reboot again. Can you access the problem sites now?
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