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I am thinking you are having DNS Cache poisoning problems or DNS hijacking. Someone is not letting you go to the websites you want to go to, by over riding certain stuff I believe and messing with your DNS. I don't know a whole lot about this, as I have never gotten to learn about this. Possibly, if one of your antivirus companys allows you to contact them for help, such as Mcafee, or Avast! (I think), they may have some experts who can remove the problem. Hope you can remove it.