Your computer have some type(s) of spyware and malware that redirects your browser. First read THIS to better understand what is happening, then repost your question in our Security & Virus Forum for better help.
Besides the browser hi-jacking as indicated by XPUser there is the possibility the the web site itself has been hi-jacked and you are being redirected from there. You usualy know when this has happened as you will ofen get redirected to some pornographic web site.
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