I am currently having a problem with my CD/DVD burner on a Gateway 507GR desktop computer. I have reinstalled the Itunes on my computer. It will burn two CDs then on the third CD will come up with an error message "The attempt to burn a disc failed. There was an unknown error (4000)" after cancelling the disc burn. I have removed the upper and lower filters. I have removed and reinstalled the CD/DVD burner. I have even used the registry cleaner too. I had Nero and Real Player on the computer, too. I have removed both of those programs from my computer, too and had them cleaned out of the registry. Please help me if you can. I have gone to the Apple website and there were no help at all. HELP!!!! This is getting frustrating!!!