Hi mate, are we talking downloading from pc onto player or downloading from the internet? Now I'm not an mp3 player expert, but I can’t think of any effect Norton would have when moving files from your pc to the mp3 device. On the other hand, Norton would certainly have an effect on any software that the device or the pc use to download the mp3 files from the internet if the software hasn't been added to Norton’s firewall program permissions.
When you plug in the Samsung mp3 player can you see the device in My Computer, and if so can you access it. If you can access the device, is it possible to drag & drop mp3's into it as you would a memory flash pen.
Also, will the player not charge on any of the USB ports on the pc?