A funcionalidade de toque está desativada se você comprar a versão OEM / SB do Windows 8:
In order to promote the best “touch” experience on PCs, OEM System Builder software for Windows 8 will only support touch functionality on hardware that has been certified for touch in Windows 8. When buying Windows 8 System Builder software, look for hardware that carries the “Windows 8 Compatible” logo and that has passed certification for touch capability. Touch hardware that is not certified for Windows 8 and does not include a special code provided to OEMs during the certification process and injected into the touchscreen’s firmware will not work once the System Builder product is installed; meaning that the PC will not be touch-enabled after Windows 8 is installed. Whenever customers are looking to upgrade a touch PC with a previous version of Windows, they should be directed to purchase the retail Windows 8 Upgrade SKUs. In addition, we recommend customers who are considering the Windows 8 System Builder product should be advised about the touch limitation to avoid any potential dissatisfaction. Remember that purchasing Windows 8 System Builder software for personal use does not come with support from Microsoft.
Então você precisa da versão comercial. Para testar se o touch funciona no Win8, experimente o Enterprise Trial de 90 dias. Esta versão não deve ter limitações.