Or Linux
My main laptop already runs Linux - Puppy Linux - it's great, small, runs from DVD, every time it restarts it's like a fresh install (whilst keeping all my documents safe on the hard drive), and it still runs perfectly fine on an AMD Turion 64 laptop (which is now about 10-15 years old!). I use it a lot for web development, my main PC unfortunately uses Windows 10 but that's mainly used for Steam games, and now more Steam games are coming out for Linux it might even be a case of switching to Linux on this one and maybe even just having a VM running Windows.