Hello incinse,

since you are posting this under the General chat which is for general talking, we can't really tell which game you are referring to.

So, try giving us a few more details and I will first move your post under the support section is should be, and then reply to your problem.

Hi

I had the same problem, try to deactivate your system security/antivirus or open an exception for "aion.bin" in your firewall

Could be an error on the installation also, try to login with an other PC to see if you can login