See this - http://malwaretips.com/blogs/isearch-safefinder-net-removal/

Hi, please try working through [http://malwaretips.com/blogs/isearch-safefinder-net-removal/ Remove Isearch.SafeFinder.net (Virus Removal Guide)] by Malware Tips. '''Note that not all programs will detect all malware, so you may need to run several or all of them.''' After removal you may need to reset your home page etc., which you can do by running [https://addons.mozilla.org/en-US/firefox/addon/searchreset/ SearchReset.] ''If your question is resolved by this or another answer, please take a minute to let us know. Thank you.''