
This is annoying, because where you are aiming at depends on how far you move your mouse, and also on how fast you moved the mouse to aim. With 'Enhance pointer precision' enabled, slower mouse movements make the pointer go extra slow and faster mouse movements make the pointer go extra fast. (It enables it even if you have it turned off in the Control Panel Mouse settings.) Now when those games call the function (asking that all movement be accelerated), Windows enables the mouse 'Enhance pointer precision' feature, which adds mouse acceleration using a varying curve to control the mouse response. In XP, and later Windows versions, Microsoft changed how mouse pointer acceleration worked. Pointing and aiming in those games was OK, because the mouse response was then linear (all movement was accelerated by the same amount it was doubled). On Windows 2000 and earlier, that removed all variable acceleration.

Some older games, such as Half-Life 1, Counter-Strike 1.x, Quake, Quake 2, Unreal and others, while they are active and running, call a Windows function intending to disable variable mouse acceleration by forcing ALL movement to be accelerated by the same amount (doubled). If you don't know you need it, then you don't need it! (If you applied one of the Windows 2000 or Windows 98/95 Acceleration fixes, then 'Enhance pointer precision' must be checked ON to enable it.)

(See below for non-Administrator account use.) Answer Yes, OK to the prompts that appear.Select the REG file that matches the DPI% you use and Double-click it.Select the folder that matches the Windows version you use and Double-click it.

the 3rd slider position (might not be shown) will be 150%.) (On Windows 8.1 or 10, if you see a 'Smaller.Larger' slider, then: See if you have 100% or 125% or 150% selected.

