One of my friends has found registration key on the net, but he tells me that it works for a short time, but then the game crashes and the reg key is removed from the registry. If he doesn't register it, it plays fine. Is this the result of some kind of system that checks for duplicate keys or known keys that are on the web or is it some kind of bug? I would like to register but I don't want to waste my 9 dollars (i'm a bit of a tightass).