Norton won't let Itunes update- how do I add this update to the "safe" list?

I'm trying to update my ITunes but it won't work and I believe it is because Norton is not recognizing it as safe- today I got a message from Norton indicating the download/sender wasn't recognized.  I went into Norton admin and tried to see if I could add ITunes as "safe" but cannot find where to do this.  Please help?

Thanks!