I am missing that file from my comp also. Pretty much the only thing I found to fix it was to install Yahoo messenger back in but thats's the problem... I don't want Yahoo messenger. How do I keep that file so I don't get the error messege without having to keep Yahoo messenger?

Pretty simple really.
Just reinstall Yahoo messenger then UNINSTALL it again.
Job done.

You don't need that file as its part of Yahoo messenger.