After hackshield has been done, nothing appears and no error message has appeared either.
It stopped working once I started up my computer. I immediately attempt to relaunch the game but Client.exe in the processes disappears after hackshield finished. Same thing, nothing appears. Both nexon and steam Mabinogi doesn't work now.

I had already checked the forums and no one seems to found a solution. So far I only know one person who is having this problem on

I tried :
System restored it to the previous point where Mabinogi worked but it still didn't.
Re-installed Mabinogi and on steam.
Verify Integrity of Game Cache on steam.
I checked the registry for errors and cleaned it.
Updated all my drivers to the latest versions.

Computer Specs:
CPU: Intel Core i5-2500 3.30 GHz
Ram: 8GB
Graphics: NVidia GeForce GTX 560
OS: Windows 7 64 bit