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I tried to play all day and everytime Gameguard would run after hitting the play button on the NCSoft launcher my computer would reboot.
I experimented with various things and finally discovered that if I close Online Armor (an excellent firewall program) Aion would finally work (BTW I am using Vista Home).
I hope that NCSoft learns how horrible Gameguard really is because if I have to choose between a game and my online security I do not think that a game that runs Gameguard will win.
Hopefully, they will get everything fixed before the launch later this month.