I mean that in my computer, it doesn't appear the font of the letters in the game. ¿The letters aren't shown because my Win 7 doesn't run them, or do I need to download the necessary font?
No you shouldn't need to download the font I'm not sure why this would happen, sorry :/
All I can suggest is that you try re-downloading it and be sure to extract the .zip before running the game
I was download again, and the problem is the same: