Install the following -before- installing Garena ;
http://www.codeweavers.com/compatibility/browse/name/?app_id=7854
This is also available as a builtin target in the cxinstaller GUI
in the 'Community Supported Applications' section.
After that when you install Garena, do not start the client when
the installer finishes - uncheck the 2 tick boxes and just exit the
installer to let crossover complete installation tasks.
Once all is finished, start Garena itself and login using your Garena
username/password. Note: I don't use this client, but I did notice a
DRM function failing in the client itself -- I have no idea if this
goes on to affect other program operations, I'm just mentioning it for
the sake of completeness...
Cheers!