If you are able to confirm that the expansion is registered using the steps Ziyyigo-Tipyigo provided, the issue would lie with the installation media itself. If an expansion is grayed out it means that the PlayOnline Viewer or Final Fantasy XI is unable to read the installation from your CD. The only suggestion we would be able to provide, besides fully uninstalling and reinstalling the entire game, would be to acquire new installation media. With the upcoming release of Seekers of Adoulin, the Ultimate Collection: Seekers Edition would be a good option to do this. Purchasing the Ultimate Collection: Abyssea Edition would also resolve this issue.