Look at this:
That's Windows 8.1. Some programs simply don't work right after some changes behind the scenes in Windows 8.1. You'll see that the mouse and mouse driver still get the full 1000Hz of data the mouse sends, and programs can get to that data if they use DirectX.
If you run into that problem with some program you use, you can start the program in compatibility mode for Windows 8 and it will work correctly.