Sorry to hear that you’re having trouble with this. Could you please provide the following information?
- The exact make and model of the computer and touchscreen monitor.
- Whether the problem began after restarting the computer or installing a Windows update.
- In Device Manager > Human Interface Devices, does an HID-compliant touchscreen appear? If so, does it show a warning symbol or indicate that it is disabled?
If this is an external touchscreen monitor, please also confirm that its USB upstream/data cable is connected directly to the computer, since HDMI or DisplayPort alone normally carries the picture but not the touch input.
Once I have this information, I will be able to provide more specific guidance.