How to Close Gameguard
An external anti-cheat utility, GameGuard uses process and memory monitoring to detect game hacks that match algorithms stored in its database. GameGuard also blocks outside programs from interfering with programming interfaces such as DirectX technology. While this utility is required when playing online, it can sometimes lower overall game and computer performance because of the periodic memory scanning. You can disable GameGuard for single-player games to gain a performance boost.
Right-click your taskbar and click "Start Task Manager."
Click the "Processes" tab.
Click the "Show processes from all users" button at the bottom.
Right-click "Gamemon.des" from the process list and then click "End Process."
Press the "End process" button on the confirmation dialog.