Computer scientist backed by 44 years of experience. I survived to almost every Windows version, but I gave up when the terrible Windows 8 showed its ugly little nose. The only three good versions of Windows are, in that order, 3.11, xp and Seven.

Linux only since 2003. Ubuntu does the trick : you can do anything (or so) through GUIs but the real fun is the command line. Great system. I frequently try different Linux flavors in VirtualBox virtual machines, thanks to distrowatch.com. Never, never forget to always have an up-to-date "Boot Repair" bootable USB key.