Dell XPS 15z Cypress trackpad not working

Hi,
I have recently upgraded my Dell XPS 15z to Windows 10 and manually installed the drivers for Trackpad using the instructions posted in the forum but after 10 days the Trackpad stopped working. So I came back to Windows 7 hoping it works but no use. I uninstalled and installed the drivers again but it doesn't even show in the system tray. Also in the mouse properties there is no Cypress Track pad properties tab. Any help would be appreciated