I recently replaced the hard drive on XPS 15 L521x laptop, with Windows 7 operating system. I used factory restore disks to reinstall Windows 7, and then downloaded all current updates. Now the touchpad does not work. On Control Panel, I went to Hardware and Sound. Under Devices and Printers I clicked on "Mouse". This took me to a page titled "Mouse Properties." I clicked on the tab for "Dell Touchpad." This took me to a picture of the touchpad. Under the picture, there is a link that says "Click to change Dell Touchpad settings." This took me to a screen that says "Dell Pointing Devices." This screen has a place to turn the touchpad on or off. I clicked "on", and it lit up green. Then I clicked where it says "Save." But the touchpad still does not work.
Is there anything else I can do to make the touchpad work again?