My client won't open... i can't play :(

[Casmii]

When i try to start my client, i press the "Connect" button on the launcher but when client shows up it suddenly closes... wat can i do? why is this!?!?
Help plz
Thank you

 

[Subzero]

Try to turn off ur anti-virus and activate ur firewalls.

 

[Demure]

Try to re-install the client then try to connect to server.It happen to me also, but i resolved it already.

 

[StorMy]

try the compatibility mode with Windows Nt 0.4