To change the default language on your computer, you will need to follow these steps:

1. Open the Settings window by pressing the Start button if you’re using Windows 10, or select Start > Control Panel > Clock, Language, and Region within Windows 7.
2. Choose Language from the left-side pane.
3. Select your preferred language from the list of languages currently installed on your computer.
4. Click Set as default.
5. You will be prompted to restart your computer in order to complete the language change.