Help please

Today, I saw a message on internet, saying that there would be some intresting stuff at www.qzwz.com. However, this is an obnoxious webpage. It also changed my internet setting. Everytime when I strated my internet, it went to this obnoxious page. Can anyone help me how I can change it back. Also, please be aware that never go to www.booluo.com and www.cn333.net. All of these three are bad webpages. Thanks.

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