Help Needed …

Hey everyone,
I got this problem, I got this online game called EverQuest II, I downloaded the game, and all the upgrades, but everytime I want to start the game and press play, the computer restarts without giving me any error messages, and by the way the computer works fine 100%, and this is the only problem I got, I’ve been told to check the requierments of the game and I did …
Anyone can help me and tell me what to do ???

Thanks !