Nexon is ****ing clumsy can't fix anything for ****.
I can't play a game this is the shit I get... "Fail to update protection modules!-Error Code[0x30000090] Any one know what this means??
It means you re-named your C:\Nexon\Combat Arms\HShield folder to something it's not supposed to be.
Re-name the folder back to HShield and it should solve your problem.