Medium is not writable

Since a month ago suddenly I can not write to my CD-RW anymore. Everything was working fine, and then nothing.

I am using Nero Express Ver 5.5.10.54 and do get following error when ever I try to write to the CD-RW.

Medium is not writable
Please insert a writable medium.

I am using an Imation 52X24X52 CD-RW burner, and I know my writer is OK. ( I had Imation verify the CD-RW).

I have used CD-R or CD-RW as a blank media.

Any suggestions?

Following are some info from the NeroHistory log file:

Windows 2000 5.0
IA32
WinAspi: File ‘Wnaspi32.dll’: Ver=4.70, size=45568 bytes, created 12/10/2001 5:32:34 PM
ahead WinASPI: File ‘C:\Program Files\Ahead\Nero\Wnaspi32.dll’: Ver=2.0.1.59, size=160016 bytes, created 12/27/2003 12:23:38 PM
Nero Version: 5.5.10.54 (Nero Express)
Recorder: <CD-RW CDR-6S52> Version: 6SG1 - HA 0 TA 0 - 5.5.10.54
Adapter driver: <atapi> HA 0
Drive buffer : 2048kB
Bus Type : default (0) -> ATAPI, detected: ATAPI
CD-ROM: <SONY DVD-ROM DDU1621>Version: S1.6 - HA 0 TA 1 - 5.5.10.54
Adapter driver: <atapi> HA 0
Bus Type : default (0) -> ATAPI, detected: ATAPI

=== Scsi-Device-Map ===
CdRomPeripheral : CD-RW CDR-6S52 atapi Port 0 ID 0 DMA: On
CdRomPeripheral : SONY DVD-ROM DDU1621 atapi Port 0 ID 1 DMA: On
DiskPeripheral : Maxtor 6Y060L0 atapi Port 1 ID 0 DMA: On