Hi pipfromslitherine. Thank you for the response. The only problem is that I have given them back their installation media and I am in a different state. Also - since I uninstalled, I do not have the serial number any more. Would love to simply purchase from your site and download, then let them ins...

I was using a friends copy of this game to evaluate prior to purchasing. I am now ready to purchase. Unfortunately, I registered their serial number for the game to play multiplayer. So now I need to UNREGISTER it. Can anyone tell me how this is done?