I think this was installed by a fake Adobe FLASH installer.
I removed most of it myself, but I could not get rid of this problem with Chrome: If I started Chrome and then killed all the open tabs, what was left was a chrome widow that had a search box in the middle of the Chrome window. Above the search box it said SEARCH in google colors, below the search box was a button that said SMART SEARCH. If you clicked on the button, it brought you to a weKnow.ac website. which looked like t