I bought this Inspiron 15-7579 in March - 3-4 months ago. Already the touch screen isn't working. I had Geek squad log in remotely to try and fix it and they were unable to repair it. It appears that it never had one! This happened about a month ago after a Dell update.
Also, I am unable to use the Dell Support tool! It says that is "Unauthorized to use on this system" So I uninstalled it and reinstalled a fresh version. And now I get "Error 1603 Fatal Error during installation"
I am very unhappy with this laptop.
I'm assuming windows 10 is on the system.....
I'd suggest you update the System Setup(BIOS). Please click on link below to safety install latest BIOS version.
After installing latest BIOS version and touch screen still isn't fix, I suggest installing Chipset drivers and Firmware, and Video in correct (Installation) order