BleepingComputer.com: Problems With Internet Explorer Opening New Windows

I have been having problems with Internet Explorer opening a new window every time I click on a link in my search results. I had no problems with this yesterday. When I went to type in a search yesterday and click on one of the search results, it only opened in the same window, it did not open it in a seperate window. So my question is how do I stop this from happening? What has happened with my computer, this is really annoying.