The touchpad scrolling could have been disabled through the system reverting to a very basic driver or through user input by adjusting the options within the touchpad's configuration utility,
Click Start or tap the Windows key and type mouse the select Mouse from the Control Panel section of the list above. In the Mouse Properties dialog, go to the Touchpad tab to see if you can open the Lenova Touchpad utility from there.
If you are getting no satisfaction from locating or using the Lenova Touchpad utility, go to the Lenova E531 support site and download the latest drivers and utility software for your machine. I checked and the Lenova site seems to list it as a ThinkPad Edge E531. Due the site's webbot exclusion, you'll have to locate the model yourself starting at the link below.