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Why do I get '500 internal server error' when using all search engines? I am able to type web addresses into the address bar successfully.

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I am able to use the interbet if I know the web address but whenever I try to us a search engine I have the '500 internal server error - nginx'. I have recently uninstalled hitman pro and rapport. Really grateful for help. Using windows XP and Firefox 4

I am able to use the interbet if I know the web address but whenever I try to us a search engine I have the '500 internal server error - nginx'. I have recently uninstalled hitman pro and rapport. Really grateful for help. Using windows XP and Firefox 4

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I have this issue and believe it is related to a MALWARE virus that has affected my laptops registry. Any suggestions?