The First reason could be that your Cache files have become corrupted and deleting them will fix the issue.
To do this follow either of these paths depending on your Operating System.
Windows XP:
C:\Users\<User Name\App Data\
Vista and 7:
C:\Users\<User Name>\App Data\Roaming
Once you can see inside those folders delete the Sports Interactive Folder.
If you can’t see those folders you will have to make “Hidden” files viewable.
For Vista and 7:
In a window, go to 'Organize'->'Folder and Search Options'->'View'-> and select 'Show hidden files and folders'.
For XP:
Make sure you are able to see hidden folders:
When in a window, go to 'Tools'->'Folder Options'->'View'-> and make sure 'Show hidden files and folders' is selected.