1. Smoke in the break room ONLY. 2. ONLY safety goggles with indirect vents and anti-fog lenses are allowed. 3. ALMOST every experiment failed; nearly 90 percent failed. 4. ON THE WAY TO THE STORE, she saw a puppy and a kitten. 5. Flying over, the elephant herd IN THE AFRICAN LANDSCAPE looked magnificent. 6. ON OUR WAY TO A FIELD TRIP, we saw dinosaurs AT the Natural History Museum.
Yahoo didn't install it, It most likely came from something already in your computer somewhere, from a previous web browse. Opening your browser gave it access to the internet to install itself. Or your browser has been hijacked and your homepage replaced with a page that LOOKS like yahoo, but the links go somewhere else. You need to run an antispyware utility and a virus scan.