Changing Windows 8 language settings

I recently bought a laptop on ebay and when i received it I found the system language was Portuguese. I set up the laptop but when i set the language to English I found that there were some parts still in Portuguese, for example, at login it says Senha instead of password, or to hover over volume says Alto-Felantes intead of Volume. I am on Windows 8 and was wondering does anyone know how to totally overide the Portuguese language settings. Any help is greatly appreciated.