I do have a Creative 6424 and it is working fine on RC2 and RC3. Uninstall your current version of Nero and get the latest version (4.0.7.5 so far) You also need a working ASPI for win2k, which can be downloaded at Ahead home page.
You can use it free of charge if you have a Creative burner. The code can be found at ahead home page: http://www.ahead.de/Creative.htm