Hi Tyler,
Did you try to uninstall and reinstall the game as suggested by Kevin?
You may check if the game is compatible with Windows 8. Contact the game manufacturer. To troubleshoot the compatibility issue, uninstall the game in install it in compatibility mode. To do so, you will need to uninstall the game and when installing; right-click on the game and click 'Troubleshoot compatibility mode'. Follow the procedure and select either Windows 7 or vista from the list to check if it works. Here is an article which will explain more about compatibility mode:
http://windows.microsoft.com/en-us/windows-8/what-program-compatibility
You also told it worked perfectly fine an year ago, which operating system was it installed back then?
Hope the information helps. Keep us updated on the status of the issue.