Login issues

Every time i click the client to log in all i get is a black black screen then it bumps me out to my desk top without even getting me to the log in screen... i already un-installed the game once and then reinstalled it and that didn't fix it... what's next?

Try to download a new reinstaller from a different source, maybe the source you downloaded it from is faulty. Other then that, I apologize, but I have no idea how to help you, if my idea doesn't work, ask some people on GC (gamecheetah.com), they probably can help you.

I cant login
it says
that i already login or that er is an server check.
who can help me


PS.I dont have an acount on the site