When I was about seven years old my parents bought their first computer, an IBM 486. They bought it from a local computer mechanic, who pre-installed a few games for us beforehand. One of those games was X-Wing. I was a Star Wars nut at the time, so playing that game was like a dream come true. About a year later it got even better when my parents got me Tie Fighter for Christmas. I played that game religiously for at least five years.
I played all sorts of great games on that machine. Knights of the Sky, Red Baron, A-10: Tank Killer, Myst, Swamp Gas, etc.