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How can I set the search engine used by Chrome back to the default?

21 Mar 2012
Chrome 17
21 Mar 2012 | Windows | Chrome 17

I installed some software and it changed the default search engine in Google Chrome. I guess it’s a virus, or something like that. The problem is that on the option in Chrome it says that Google is the default, but that’s obviously not the case. I tried to re-install Chrome and tried to delete browsing data but nothing worked. Can anyone help me? This problem means I can’t type search content into the URL field, and that’s a feature I can’t live without.