U920T Touch Screen Problem after updates windows 8.1

After some updates (automatic) the touch screen of my Satellite U920T is off : when I take a look to the computer properties, it said that the computer is not compatible with "touch screen" (something like that) and in the configuration panel i have no options about "touch and stylet". I've uninstall HID elements from the manager : the problem is the same. I have seen that the screen element is a "standard" screen VGA : i think that's not good ! i've made all updates from toshiba (officials) : nothing change ! HOW TO recover the touch screen ! for the time being my satellite U920T is like a satellite laptop and I have bought it (much expensive...) for the touch screen with windows 8 (now windos 8.1) : DOES SOMEONE HAVE A SOLUTION ???
Best regards

Some thoughts.
1. Did you follow these instructions?
How to Update from Windows 8 to Windows 8.1
2. Check this.
Loss of touchscreen after updating to Windows 8.1.
3. I'm curious about the service. Open Services (services.msc) and scroll down to the Human Interface Device Service. Is it started?
-Jerry

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