Sometimes the need arises we change the language in installation of Oracle Universal Instaler (OUI). In this case we see a example to change from Spanish to English (USA) in Windows SERVER 2008 R2. If you start the installer, we see that appears in Spanish.
To change the language, we click on START -> CONTROL PANEL -> SYSTEM AND SECURITY -> CLOCK, LANGUAGE AND REGION -> Region and Language. Select the language you want. In this case we select English (USA).
HTH – Antonio NAVARRO