I installed both The Sims 3 and the Pets expansion pack and everything worked properly until a few days ago. I went to play and it showed that the Pets expansion pack was not installed. So I went to install it again, but every time I insert the disc to do so, it asks if I want to completely remove the expansion pack. After seeing this a few times, I decided to click yes and completely remove it. Went back to try and install it again, and I get the same "Do you want to completely remove this?" message. Can anyone help me figure out why it's doing this and how to get my expansion pack reinstalled? Thanks.