Kvadrat,

If you have already confirmed that FINAL FANTASY XI is properly installed on your system, then more than likely what has happened is that you obtained and installed the Vista Compatible version of the PlayOnline Viewer for the wrong region. While FINAL FANTASY XI has been released internationally, the software is still region-specific to the three regions it has launched in: North America, Europe, and Japan.

We would recommend uninstalling the version of the PlayOnline Viewer you have currently installed, and then return to the PlayOnline website for the region of your original software purchase to download the correct PlayOnline Viewer for your region.