Interesting problem - what to do if the game Splinter Cell saves aren't working? The obvious first step is to exclude the possibility that the game saves you have been using aren't corrupted in some way.
You need to download guaranteed 100% clean Splinter Cell exploit/installer game saves. Get them to your Xbox (memory card/working USB), delete and replace the ones you are using are try again.
Fingers crossed.
This post has been edited by fallenangle: Mar 1 2012, 04:05 PM