I-tunes home sharing

Hi,

 

I am trying to move my itunes library via home sharing between an old and new (installed with Norton 360) laptop. Home sharing works on the old laptop and I can see the home sharing icon on itunes when I switch it on. However when I tune it on the new laptop it appears for a second and then disappears. I've checked my network settings are on share (as per another message on this forum) so dont think this is the issue, however I am sure this issue is caused by my security software. Im running windows 7 and have itunes version 10. Any help would be appreciated.