thanks hertell

since we don't have SPL yet, I suggest this thread being stickyed

Some suggestions:

1.- a spanish CAB ??

2.- many users vahe tryed and tryed everything before with no success, which means their PC SEUS SOFTWARE IS ALREADY MARKED with their current I-wanna-get-rid-of language. this prevents the installation of a new language...
May I suggest you to include anohter step into your guide:

UNINSTALL SEUS FROM THE PC and reinstall it after the lang CAB has been installed
delete folder C:\Program Files\Sony Ericsson\Update Service\db