Toggle Enhance pointer precision
Have you tried:
[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool SystemParametersInfo(SPI uiAction, uint uiParam, IntPtr pvParam, SPIF fWinIni);
Shamelessly lifted from:
http://www.pinvoke.net/default.aspx/user32/SystemParametersInfo.html