I forgot to say that I have updated the software to the latest current release aka 10.1.0.1008 (15 december 2010).
Did you download & install the iata_cd.exe and not iata_enu.exe?
Because your OS is not set in English it might be that your language is not currently supported out of the ones in the Multi language version in the iata_cd.exe install.
Thank you for the suggestion. Unfortunately I definitely used the iata international version. (cd).
It is not very easy to see in my screenshot but the menus (the only visible written thing) are in french.
Your OS must be corrupted then.