A:Answer Windows 10, according the to specs. Dell machines are noted for being compatible with changing the operating system to Linux distros, if desired. I've got a different laptop coming from Black Friday Best Buy, and after I make a recovery usb of it's Windows 10, I'm going to install Linux Mint on it, instead. Linux should be a screaming fast OS on this 8 GB, 128 SB SSD, laptop. Be aware that many of the high-end games are not made to work with Linux, though. I'm not a gamer, so I love Linux Mint for my machines.