I have the best configuration among all of you. Got my first computer as a Birthday Present in May 2005, when I was 15.
It was a P4 2.4GHz, with 256MB DDR1 RAM and 80GB HDD with a 17" CRT Monitor, dual booting Windows 98 and XP. Its still at home, working pretty good with a few upgrades and my younger brothers use it for their browsing and watching movies. It now has 1GB RAM and an LED monitor, running Debain Wheezy.
The internet connection was terrible those days, using a dialup modem and I remember playing GTA ViceCity and NFS HP2, but that craze lasted only for an year.
The first computer I used was from my school, which ran DOS from a floppy disk and didn't have any HDD. We played Mario, Prince and Sky Roads in it.