problem with something

after a game, window opened and the message was:

file is changed:W(2007)L(2)
CSHELL.DLL


after that i was out of the game, and every time i press to play , after XTRAP gets to 7 this message apeares.


and now I cant get in the game.
what is the problem? how can i fix it?
thank you.

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