Windows 95. It was an IBM my dad brought from work. It weighed a ton, white metal case, yellowish plastic where the floppy disk went. Floppy disks...remember those? A big game took 5 floppies (Jazz Jackrabbit anyone?). I remember the sounds that HDD made as it made booted. My parents sent me to an "Intro to Computers" course that was taught by this 70 year old guy who smoked 1 cigarette every 5 minutes (inside of course). He was an MS-DOS god (I was 7. He typed stuff and got stuff back as a response. Godlike right?). 2 weeks later I knew how to create file, directory, move a file and format my HDD to reinstall Windows in cmd. Guess which one I did first? After that Win98 and Me. I think it was the millennium edition.