CHECK USER ACCOUNT CONTROL AND ADMINISTRATOR PRIVILEGES
Make sure that your Windows user account has Administrator privileges, and thar User Account Control (UAC) is disabled in your operating system. To do this, go to Start -> Control Panel -> User Accounts and Family Safety -> User Accounts -> Change User Account Control settings. Move the slider to the lowest position ("Never notify") and click OK.
Afterwards, make sure to always launch the game with “Run as Administrator”.
CHANGE VSYNC SETTING (in-game, if possible, or in driver settings)
Check if the game allows you to enable or disable VSync (other possible names are vertical sync, vertical refresh and similar).
If there is no such setting, try forcing these settings in your graphics card's drivers. To do this, right-click an empty area on your desktop and go to
For NVIDIA cards: NVIDIA Control Panel -> 3D Settings -> Manage 3D Settings , and click “Restore”.
For ATI/AMD cards: Catalyst Control Center -> Gaming -> 3D Application Settings, and click “Defaults”.
In both cases, you shoudl experiment with different VSync settings. Different games respond to VSync differently on different systems, and the result could be input lag, visual "tearing", or reduced framerate.