Yes you can disable the various components, VirusScan, Firewall etc., but Security Center 9 is geared to throttle back when gaming mode is detected anyway. Have you tried the game anyway?
To disable do the following:
Double-click the taskbar icon to open Security Center Click Advanced Menu (bottom left) Click Configure (left) Click Computer & Files (top left) You can disable VirusScan in the right-hand module and tell it for how long.
Click Internet & Network (top left) You can disable Firewall in the right-hand module and tell it for how long.