My computer won't read The Sims 2 Pets etc on my computer. What's going on?

My computer crashed so it deleted all the sims 2 that I had on it and erased the whole hard drive on the computer. Now i've re-installed some of them like Bon Voyage and Free Time and they work just fine. But Pets, Best Of Business, and University won't even be read on my computer when I put them in, so I can't install them on my computer. What's going on?