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have just uploaded lastest firefox and cannot do any searches. Every search produces 404 not found

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It seems that no matter which search engine I use - google, yahoo, bing or any of the others, I get the same page 404 not found.

It seems that no matter which search engine I use - google, yahoo, bing or any of the others, I get the same page 404 not found.

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Do a malware check with a few malware scan programs. You need to use all programs because each detects different malware. Make sure that you update each program to get the latest version of the database.

See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked