Hello!

You should send a ticket to GMs, they will answer you as fast as they can. Go to this link. Make sure to give them the screenshots so they can give you better assistance.

Maybe you have a program in your PC that's interfering with Game Guard?

While you wait for an answer from the GMs you could try to reinstall the game completly? Or try deleting Game Guard folder and try starting the game (it'll download again, don't worry), maybe you have a missing file.