This error can occur if the English (US) language pack is not installed.
Language Pack Info
This can also occur if there is a non standard Windows "Arial" font installed, or the "Arial" font is not installed or has become corrupted.
Open the Control Panel Fonts option:
Windows 7/Vista:
Windows "Start" button > Control Panel > Appearance and Personalization > Install or remove a Font
Look in the list of installed fonts that comes up for all fonts named "Arial". You should have "Arial" and "Arial Rounded Bold" listed. Reinstall the font if it is missing or corrupted.
Also, if your system language is French, you may need to install the Language Packs available in Windows update.
From the MS site: "The Ultimate and Enterprise editions of Windows 7 were designed for language pack use. These editions can display menus, dialog boxes, Help topics, and other text in 35 different languages. Switching between them is easy and free.
To change languages, just download and install a language pack from Windows Update."
It was eleven more than necessary. Jacques Anquetil
I have seen Arial and Arial Roundend Bold between my windows fonts. Where can I get this fonts again to reinstall? But both are in my computer...
By other hand, My system language is english and I have installed the game in Spain. Must I make something extra?
Where can i get the english (Us) language pack? When you say "this error can occur if the english (us) language pack is not installed" you say language pack from game or Windows 7?
You can get the English language pack within Windows Update. Check for updates and then review all non-critical updates. You should see all 30 (or so) available packs.
Not sure this is your issue, given your reply, but it's worth ruling it out. It can't do any harm.
It was eleven more than necessary. Jacques Anquetil
