Hi Cazanonimo!
Welcome to the forums. Could you please do me a favor and try the following:
Download and install the .net 4.0 framework from microsoft.
http://www.microsoft.com/download/en/details.aspx?id=17718After installing the .net 4.0 framework, download and run the language tool from here:
http://www.lbahq.com/download.phpI believe the language changer does not work with any earlier versions of the .net framework.
If that doesn't work, let me know, and I'll show you how to change it manually.