RUN THE GAME AS ADMINISTRATOR
Use “Run as Administrator” when installing and starting the game. Do this by right-clicking on the shortcut or setup file and selecting “Run as Administrator.”
DISABLE ADDITIONAL INPUT DEVICES
Disconnect all input devices (controllers, graphics tablets, etc.) except for the keyboard and mouse. If you’re using virtual input devices like x360CE or vJoy, disconnect or disable them.
DISABLE MOUSE ACCELERATION
Disable the “Enhance pointer precision” option by following these steps:
Windows 10: Press WinKey+R, and in the Run window type: control. Then press Ok, navigate to Mouse -> Pointer Options, make sure that Enhance pointer precision is unchecked, and click OK.
Windows 8.1, 7: Go to Start -> Control Panel -> Mouse -> Pointer Options, make sure that Enhance pointer precision is unchecked, and click OK.
If you’re using a tablet PC, connect a keyboard and mouse, then temporarily disable the touchscreen. This adjustment improves game interaction.
RUN THE GAME IN CLEAN BOOT MODE
Ensure no third-party applications interfere with the game. Install and run the game in “clean boot mode”. Find instructions on how to do this here: http://support.microsoft.com/kb/929135
Remember to use an account with Administrator privileges.