Server system question...

Hey, I work as an IT for my university, and last week, my boss showed me an old storage room we had downstairs. It was full of old PCs and macs (eww) and he told me that I had to get rid of them...so i began to scavenge through all of em and I found an old server. So I picked it up and took it back home to see if it was actually worth anything. It had Windows Server Edition 2003 installed on it but i didn't have the admin password so I reformated it with Windows XP Pro. I found out it has an AMD Athlon XP 1800+, 512mb of ram, and a 40gb hd...not too shabby i thought...I wanted to know if this comp would be fast enough to set up some sort of server...maybe a counter strike source server or some game server since all my online games get blocked off by the firewall used by the school's ResNet