I have the same burner, and it does only work (for bunring) in widnows 98.
I emailed mitsumi about drivers for win2k and they said they dont have them and to just use the 98 drivers, but I still couldnt burn...
The software I use in win98 is:
1. Nero - ??
2. CDRWIN - http://www.goldenhawk.com
3. Adaptec EZ CD Creator 4.0 - http://www.adaptec.com
they all work great for me
they think that the USB is an scsi interface, so it thinks the bunrer is an scsi burner... which is pretty cool...