Ryzom

May I ask on which OS you run the client, respectively which windows version?

Looks like your user isn't allowed to write to the installation directory, it might help to run the client as privileged user (adminstrater, eg.).

Hmm, did you tried to run the client as Administrator?

And did you check the client.log in the installation directory near the end of the file, if there are more details which file (including the full path) the client couldn't write?