My search engine changed and I don't know how it happened or how to change it back?

First it was Google, but google had a virus attached so when it automatically switched to Bing. I didn't care but now its a %26quot;Fast Browser%26quot; I want to change it back to Bing.My search engine changed and I don't know how it happened or how to change it back?click on the arrow down on the very top right hand corner near the spy glass icon %26gt; click on manage search providers and select bing and click default