Google how to unintall

Go to start and open control panel then click on click on un install program .

Google is an online service and can not be uninstalled.

However, if you have google chrome installed and wish to remove it you can click the start menu icon (Windows 7 and older) or move your mouse over to the right hand upper corner (windows 8+) then go to settings >> Control Panel >> Programs and features
Find google chrome and click "Change / Remove"
The wording may differ slightly, but this will allow you to remove the application.

If google is showing up every time you open your browser (The application you use to "get online") You can change your start page or home page.
These steps depend on the browser you are using.
For simplicity I have provided a link to a pcworld article covering several browsers. There is an audio ad on the page so do not be alarmed if you hear someone speaking.