Cant turn off trackpad on Inspiron 7720 SE

Im about at my wits end- this dang thing is a pain in the backside when trying to play games or use other software because bith the trackpad and mouse are operating at the same time. I have literally tried everything- turning off in Dell utility, turning off in Windows, Disabling in device manager, deleting drivers, you name it, it will not turn off at all. Any advice?