Usb touchscreen detecting as a single touch

Hi All,

I have a touch screen which is conencted to the host pc through USB. But the touchscreen is detected as a single touch device but i have changed the descriptors of the usb in such a way that it is compatible with the Multitouch touchscreen. But windows 7 detects it as a single touch.

Can any one please suggest a solution?

Regards

Ajaraj