How do I get street view on Google Earth?

My friend has it, NOT GOOGLE MAPS. Google Earth, and it isnt working for me. What do I have to download in order for it to work?How do I get street view on Google Earth?
Go to: http://maps.google.com/ and type your address in the search bar. When the map comes up click on Street View. If Google has photoed that street you'll get the image and be able to navigate up and down the street.How do I get street view on Google Earth?
it can zoom to a certain extent