O driver do trackpad padrão da Apple não funciona com o trackpad no Windows como no Mac OS X.
Você pode tentar o Trackpad ++ :
Trackpad++ is the world's first and only alternate Windows driver for Apple Multi Touch and Force Touch trackpads found in Apple Macbook, Macbook Pro / Retina and Air notebooks. Trackpad++ driver comes with a Control Module, the comprehensive control panel.
Veja este revise para mais informações, incluindo estas observações:
comes with a graphical user interface for adjusting these preferences. It provides many more options than Apple’s barebones Boot Camp Control Panel does. However, just installing the driver should make your trackpad work better.
On 64-bit versions of Windows 7, 8, and 8.1, you’ll need to install Power Plan Assistant before Trackpad++. Power Plan Assistant will disable driver signature enforcement, allowing you to click through a warning message to install this unsigned driver.
Trackpad++ is free, but expires each week and requires a re-download and reinstall unless you “donate” to the developer to acquire a serial key.
(não tenho experiência pessoal com este utilitário.)