Hello,
when two‑finger scrolling suddenly stops working in Windows 10, the issue is usually caused by the touchpad driver.
Please check the following:
Make sure the touchpad driver provided by your PC manufacturer is installed.
Windows Update can sometimes replace the original OEM driver with a generic HID driver, which removes gesture features such as two‑finger scrolling.
Download and reinstall the touchpad driver from your laptop manufacturer’s support page.
For touchpad settings that should be checked, please refer to the AI answer.