I had this issue with my VivoBook S400CA touch screen and fixed it today doing the following:
- Go to the Control Panel.
- Go to Troubleshooting (you may have to search for it)
- Click Hardware and Sound
- In the Device section, click Hardware and Devices
- Have the wizard scan your computer for hardware issues.
- Let the computer fix whatever issues you had.
In my case there were 2 USB input devices that were disabled that the wizard enabled for me. The touchscreen immediately started working. Hope this helps someone.
UPDATE:
The problem used to come back periodically. But since updating all of my drivers a while back, the problem has not resurfaced.