Well, I just loaded up Steam so I could play a quick game of DoD: Source, and it for some reason said that DoD was not installed. The strange thing about this is that I was just playing it the other day. How can it suddenly not be installed? After I saw this, I decided to play some firearms, a third party modification for half-life 1. As soon as I clicked on it half-life was loaded up, and NOT firearms. What the hell is going on? How do I fix this? I really don't want to have to install a game that is already installed on my computer.