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Right-click on the Start menu and select Device Manager.
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In the Device Manager window that opens, select the arrow next to Human Interface Devices to expand it.
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Under Human Interface Devices, right-click on HID-compliant touch screen and select either Enable device or Disable device depending on which action is desired.
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If there are multiple HID-compliant touch screen devices listed, repeat the steps for each device.
If the touchscreen isn't working, see What to try if a touchscreen doesn't work in Windows.
