Depending on your browser it is a little different but go to your "Internet options" or "options" menu and a window will appear then delete "www.google.com" from your homepage and put the page of your choice.
When you go to google.com, at the bottom, it will say make google my home page. Then just press it Or, you can go up to "tools" on the menu bar, press options, or internet options, depends on what...