npkcrypt is Nprotect/GameGuard software which is intergrated
into some online game like MapleStory , Gunbound.
Nprotect/Gameguard is to prevent hacking of the online game.
But it is recommended that you use anti-spyware software to scan
your computer because some malicious software can disguise
themselve as Nprotect/GameGuard.
Try using Webroot
Spy Sweeper