error (200) ? An illegal program has been detected. Close unnecessary programs and try again.
Solution 1
Hit ?Ctrl+Shift+Esc? to launch Task Manager. Terminate any unnecessary or illegal (hacking) programs or processes. If you need help on solving error 200, post a screenshot of your running processes in a new thread.
Solution 2
Scan your computer with an up-to-date virus scanner to remove viruses that may be in the blacklist of nProtect.
Solution 3
Run Windows in Diagnostic Startup
1. Start> Run> Type in msconfig> OK
2. Under ?General?, select Diagnostic Startup and reboot your computer
source:
List of GameGuard Errors (with possible solutions) Ayumilove MapleStory Blog + FAQ : Your Hidden-Sanctuary for MapleStory Guide