If you're not ready for a new PC, you can opt to buy a supported external webcam like Logitech's Brio 4K Pro or Razer's Stargazer.
Your PC will need an infrared (IR) camera to use the feature, which are more common in new laptops and two-in-ones from the past couple years, including those from Dell, Lenovo and Asus. Unfortunately, not every webcam will work with Windows Hello. It also works with more than a dozen apps like DropBox, iHeartRadio and OneDrive, so you can skip typing in a password. Using your Windows 10 laptop or tablet's built-in webcam, Hello uses facial recognition to get you in and working in under two seconds. The upcoming iPhone X might be Apple's first to let you unlock the device with your face, but Microsoft was there first with Windows Hello.