At a Loss

Hello fellow members.

Hope to find some help.
I have NEC DVD-RW ND-3540A using W98SE O/S. The tray is the only thing that works.
Inserting any CD I get a message “drive not ready”. The unit is recognized in SETUP and Device Manager.
I have downloaded firmware V1.04 but have not attempted to ectivate it yet. Present Firmware is V1.01.
Can some kind person suggest how I can get the unit to work? Thanks