Seeing as the text there is in Spanish, I'm assuming the likely problem's that your computer isn't set to run under an English environment, which is what the English translation of Ib requires.
In case you don't know how to do that, here's a step by step guide:
1. Go to Start > Control panel > Regional and Language Options
2. Under the first tab (Regional Options) switch the language to one of the "English" settings. I don't think it matters which, but I have it set to, "English (United States)".
3. Under the third tab (Advanced) switch the language setting to the same thing you set it to in the first tab (So if you set it to "English (United States)" Previously, you would set it to "English (United States)" here, as well).
4. Click "apply". if your computer has the required language pack, it should then ask if you want to use the language files installed on your hard disk. If it does this, then click "Yes", and your computer should say that it needs to restart in order to click the procedure. When you're ready for it to do so, click "Yes".
5. Once your computer is done restarting, your computer will now be set to "English", so Ib, and other games designed to work in an English environment will hopefully run without problems. You can switch the language back to Spanish (or whatever language you had it set to prevously) when you're done playing those games, in the same way you set your computer to English.
I did it, now the game works fine! thanks, there was another problem later, with mp3 files in the music folder, but managed to fix it by converting them into WAV files
Now i can finally enjoy this game!