It seems that some systems, at least Chinese that I know about, have problems with the accents in the language filenames. Well, more just things that I didn't know I had to deal with..
Can you either remove all the language files or rename them to remove the accents to see if it helps? eg. Espanol.lang
I'm installing a Chinese version of XP just now to figure out why the filenames aren't usable with accents on those systems.