Thread:Project:Support desk/Characters displaying incorrectly

Hi! I already upgrade my wiki from 1.16.2 to 1.19. But I'm having problem with special characters, like accents, tildes, etc., so it seems there's some articles missing, even though they are, because those special characters are displaying incorrectly like InstalaciÃ³n y ConfiguraciÃ³n. Please I need help urgently.

Running: Mediawiki 1.19.1, PHP version 	5.3.6 and MySQL version 5.1.63-cll URL: http://www.arandatraining.com/wikinueva/index.php?title=Instalaci%C3%83%C2%B3n_y_Configuraci%C3%83%C2%B3n_Aranda_SOFTWARE_DELIVERY_V_8.0