I purchased and installed Assassin's Creed 4. It wasn't working. Then when I logged out and logged back in I couldn't get my serial code. After changing my password I came back into my steam to find that all of my friends are gone and that I have to purchase Assassin's Creed again. It says that I have installed it but I cannot play it because i have to buy it again. I did purchase it and I got an email saying so.
How can I fix this?