Problems with all private servers

I'm running 64 bit windows, that's the only difference I've been able to tell from my old comp.


All of these private servers I have been trying to play with their own custom clients and what not, have not been working.

I login, and everything starts fine. First click when I move is fine. But then the second click closes the client.

 

Maybe you need more ram? Your computer could be using up to much cpu so it ends to process.