i am using Acer Z3731 all in one windows 7 home premium 64bit . i recently ugraded to Windows 8.1 but the touch screen functionality did not work with upgrade. i need help on how i can get drivers to work with it. i realise this is a common problem Acer support team are not willing to help. i dont understand. pls i need help other wise i pass on d computer to a charity. thank u.