Explanation:
Why Windows 7 and Vista?
Vista and windows 7 has a featured called User Account Control(UAC) which windows xp doesn't have it. In the case of Grand Chase when the Client is running "Main.exe", UAC is blocking it to run as Administrator assuming it is only running as a "Guest" Program. So its it will not reach it's maximum potential at security. That explains while unlocker detects it as a "Process".
Although there is a method for windows xp to detect "main.exe"
1st Method...
1. Activate your Guest Account in User Account at Control Panel.
2. Run your hacks and Grand Chase.
3. Unlock using Unlocker.
2nd Method...
1. Download suDown
SuDown work's like UAC but can run on windows XP.
Download here:

2. Run your Hacks as "Administrator"
and your Grand Chase as *suDown
3. Try Unlocking the Ai.kom
Yet, I haven't tested this 2 methods because my OS is "Windows 7"
If both method didn't work. Try Combining the two method.






