Within the past few weeks Yahoo search engine has "hijacked" Google search, which has been my default when using Firefox. I have Windows 7. I have tried every "fix" suggested online, including deleting Yahoo every place I can find it, including Registry and Control Panel. I have also tried the recommendations regarding keyword.URL under about:config. I have used Viper, PC Health Advisor, PC Tools Privacy Guardian and Speedy PC Pro in an attempt to find and remove virus, worm or malware. No success. I would appreciate your recommendations.

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