I got a new, external, Memorex DVD (DL) burner for Xmas but I'm having a problem getting started. A Nero 6 installation CD came with the drive but Nero 6 and Nero smart start, were already installed on my computer. So I threw a DVD into the drive on my laptop and set the Memorex drive as the destination. Then I clicked on burn and it promptly says, "COMPILATION WILL NOT FIT ONTO BLANK DISC". The blank disc is 2 hours and the DVD I want to copy is 1 hour 45 min. WHY IS IT SAYING THIS? HOW CAN I CORRECT THE PROBLEM?