Touchscreen just stopped working - With load out of Windows 8.1 completed + Office, I added old files from HD of last build and Touchscreen stopped working.

Monitor is Acer T272HL and Driver is/was up to date.

How do I find the setting that has been affected and turn the touch ability back on?

Does it happen after load you files or since you installed your Windows?

Run Windows Update and install all updates.

Visit Acer website and install latest driver related to touch screen.