Error message sadly does not tell anything useful.
There might be some antivirus or security program interfering.
There might be write access restrictions to some of the files (especially if installed in Program Files folder), this could be 'fixed' by running as administrator.
If using Windows 10, then I've seen programs crash for no good reason unless using 'windows 7' (or xp) compatibility mode.
If you do not use Steam version, then there might be newer beta client be available from http://ryzom.kervala.net/clients/
There might be some antivirus or security program interfering.
There might be write access restrictions to some of the files (especially if installed in Program Files folder), this could be 'fixed' by running as administrator.
If using Windows 10, then I've seen programs crash for no good reason unless using 'windows 7' (or xp) compatibility mode.
If you do not use Steam version, then there might be newer beta client be available from http://ryzom.kervala.net/clients/
---
Hello!