Lenovo Ideapad 100 15.6".

Windows 10

Windows 10 is the best combination of the Windows you already know, plus lots of great improvements youll love. Technologies like InstantGo* let you boot up and resume quickly, everything runs fast and smooth, and Windows 10 devices now have Battery Saver to automatically conserve power so you can work longer and play harder. For total confidence, Windows 10 helps you stay up to date and has more built-in security features than ever for helping protect against malicious software.