The good thing is that this is a laptop and not a tablet, and so you can connect a USB mouse to this for controls. With a USB mouse installed, I would roll back the update to a previous restore point. Then with the touch screen hopefully working again, then try the update again. If the update truely is the cause for the loss of touch screen controls, we can go from there and reinstall the touchscreen driver. And hopefully the reinstallation of the driver will fix this. The reason to go backwards first to a restore point before going forward with just reinstallation of the driver now, is because we want to get the touch screen back to a working state so we know that the hardware for the touch screen is in fact still good.