Yeah, choose which you like between Roxio and Nero, and just use one would be my advice.
Now. Since it’s not Alcohol or Daemon Tools etc causing this, then it could be the packet-writing portion of either Nero or Roxio.
Whichever software you decide to reinstall, don’t install Nero’s InCD or Roxio’s Drag to Disk (I think that’s what the Roxio packet writing part is called).
I think it’s a software problem…it’s just finding out which software is causing the problem
Mind you, if it were me…I’d bite the bullet and reinstall everything