Hi Daniel,
Unfortunately, as dexter also correctly points out, you're responsible for your own possessions. So there's no chance of getting a new game sent to you, as you can imagine. Sorry.
But, according to the EULA, you are allowed to have one single backup copy of the game that you own a license for.
So, if you were to download the game from a torrent site, then you would not be breaking any rules, since you have a license for the game. You may download that which you already own, in case of emergency, as a backup.
This might be the only solution left to you, unless you can find the disc agian. Please be adviced though, the downloads offered on torrent sites are often accompanied by cracks, key generators and the likes. These are likely to contain malware, viruses, etc.
Download all this at your own risk of course, and don't use such additional content, only use the game installer itself, with your own valid license key. Then you'll end up with a normal and fully functional installation again.
Regards,
Fred
