Complete ALL of these steps and get back to me.
1 - Simply restart your computer
2 - When you re-install CA make sure you uninstalled CA first
3 - Make a new Nexon passport and try logging in then
4 - Make sure that your firewall/anti-virus is not blocking CA
5 - When starting combat arms, make sure NO other programs are running (Engine.exe could detect it as a threat)
6 - Run as administrator
7 - Run the latest manual patch from Combatarms.nexon.net
8 - Change your IP address (You could be banned)
9 - Scan your computer for viruses
10 - Make sure CA is not running in 64-bit (Right click the icon/Properties/Compatibility) and check
Best of luck to you man, I will not be following this thread so please PM me
Thanks (: