Well spotted Paradox. Shh..
Ok Edward, that's an original BS dvd from 2008 ish. You may know that DCS has moved on a bit since then but your BS should still be playable. If you get into the sim you could upgrade to the current World but you would need to purchase BS again for the newest version.
I assume you have the software installed. It should give you two icons, one single player, one multiplayer. What happens when you try to start the single player game?