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Suspicious websites come up when I click a search engine result

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Ever since I installed Firefox 4 I've been having problems. Whenever I search for something and I click a result, sites such as Commander Search, Tao Wen or something Asia comes up instead of the website I want. I've downgraded Firefox to 3.6.16 and I STILL have this problem. I never had this before I installed FF4. It is also taking 3s more than usual to finish a google search. What is wrong?

Ever since I installed Firefox 4 I've been having problems. Whenever I search for something and I click a result, sites such as Commander Search, Tao Wen or something Asia comes up instead of the website I want. I've downgraded Firefox to 3.6.16 and I STILL have this problem. I never had this before I installed FF4. It is also taking 3s more than usual to finish a google search. What is wrong?

All Replies (3)

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Did you download Firefox 4 from the official website http://www.mozilla.com/firefox/ or from somewhere else?

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Scan your pc for spyware. You can do this by running hitman pro for example. (http://www.surfright.nl/en/downloads)

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Hi. Yes, I downloaded FF4 from the official site and downgraded using the links in FF, but it is possible that I might have had downloaded spyware somewhere else during the same time I was doing upgrades. I will run comprehensive scans. Thank you!