Played any other games? Is AOC only one that does this? (if not you might want to double check if you installed all drivers such as motherboard drivers, graphic drivers, soundcard drivers, making sure they ain't beta, making sure you've got lastest directX, turning RAID mode on for your harddrive).
Yes ive played other games and AOC is the only game that does this, i got 500gb memory. Now is it my PC's fault or AoC?
Mate there ain't simple answer, we need more information, it might be fault of neither or one of those. You never know. Mind giving full specs of your computer? Also have you installed all the latest drivers for all hardware from mother board to your grafics card and the directx? What OS are you running the game on? What brand is your RAM-memory and how much have you got?
I'm happy to help if I can but I need very detailed information to even attempt that.