There are a few possible reasons why Fishdom may have stopped working for you. First, check to see if your computer meets the minimum system requirements for the game. If it doesn't, that could be why the game isn't working. Second, try updating your video and audio drivers. Out-of-date drivers can sometimes cause problems with games. Third, make sure you have the latest version of DirectX installed on your computer.Fishdom is a DirectX 9 game, so you need at least DirectX 9.0c installed to play it. You can download the latest version of DirectX from Microsoft's website. Finally, if none of those things work, try reinstalling Fishdom. Sometimes simply reinstalling a game can fix problems like this.