Problem with Nero

When i try to create a Data DVD with Nero by drag ‘n’ drop some folders with a lot of files inside them, Nero takes about 4 minutes to switch to Nero Express or to ceate a new folder. This also happens when i press the “burn” button until the DVD recorder starts copying.I have no problems when i try to copy less files. My recorder is a liteon 451s. This problem occurs in both Windows XP andWindows 98SE