iPod -50 Library cannot be saved

Yeah, I've had this same thing happen to me on my XP Professional installation. I first noticed the message after installing sony connect music store or whatever that's called (just to get 10 free songs). After the install, the library cannot be saved kept popping up in iTunes, so I checked a box that disabled the showing of the error. I have since uninstalled sony connect, but i don't know if the error is gone or not, as I disabled the dialogue box. Haven't had any problems with the library or ipod malfunction, so I ignore it.