A few relatively old games:
System Shock (spiritual successor to Bio Shock)
Sting (reeeally hard to find, tho worth the play!)
also, my two cents regarding ur machine: its likely ur runnin Win XP, n the 512 mb ram u mentioned has pretty much been gobbled by ur OS. Go for more RAM! and while ur at it get a GPU with at least 256 mb n ur golden
System Shock (spiritual successor to Bio Shock)
Sting (reeeally hard to find, tho worth the play!)
also, my two cents regarding ur machine: its likely ur runnin Win XP, n the 512 mb ram u mentioned has pretty much been gobbled by ur OS. Go for more RAM! and while ur at it get a GPU with at least 256 mb n ur golden