1. A computer-implemented method for providing secure access to a computer, the method comprising: capturing a first image of a user with a camera at the computer in response to the user logging into a user account on the computer; extracting facial features from the first image; capturing, after the capturing of the first image and while the user is still logged into the user account, a second image with the camera at the computer; extracting facial features from the second image; comparing the facial features extracted from the second image with the facial features extracted from the first image; if the facial features extracted from the second image match the facial features extracted from the first image, then staying logged into the user account; and if the facial features extracted from the second image do not match the facial features extracted from the first image, then automatically logging out of the user account.