lol. try this, it can't hurt.. uninstall CA and delete the nexon folder after. Reinstall CA, then go and turn DEP off for CA.exe, then turn off your UAC and after that extract the pub. in the CA folder rename to blah blah.asi. Restart your comp and see if that doesn't werk
Oh and if you run Utorrent, bittorrent ect... that could the problem