When i try to burn a CD, Nero burns for a few seconds and then abort. I had this problem last time i installed w2k but i solved it, don't remember how..

Now i've reinstalled w2k and it happens again..
nero's logfile for the last cd-creation failure:
Recorder: <YAMAHA CDR400t> Version: 1.0q - HA 2
15:33:41 #11 Phase 36 File dlgbrnst.cpp, Line 1353
Burn process ####ted at 1x (150 KB/s)
15:33:41 #12 Text 0 File ThreadedTransferInterface.cpp, Line 1836
Verifying CD position of item 0 (relocatable, CD pos, no patch infos, orig at #0): write at #0
15:34:18 #13 SCSI -1064 File Cdrdrv.cpp, Line 1353
SCSI Exec, HA 2, TA 1, LUN 0, buffer 0x02453CF4
Status: 0x04 (0x01, SCSI_ERR)
HA-Status 0x00 (0x00, OK)
TA-Status 0x02 (0x01, SCSI_TASTATUS_CHKCOND)
Sense ###: 0x05 (###_ILLEGAL_REQUEST)
Sense Code: 0x21
Sense Qual: 0x00
CDB Data: 0x2A 0x00 0x00 0x00 0x04 0x92 0x00 0x00 0x1E 0x00
Sense Data: 0x70 0x00 0x05 0x00 0x00 0x00 0x00 0x0A
0x00 0x00 0x00 0x00 0x21 0x00
15:34:18 #14 mmc -1064 File Writer.cpp, Line 311
Invalid block address
15:34:18 #15 Text 0 File ThreadedTransfer.cpp, Line 218
all writers idle, stopping conversion
15:34:18 #16 Text 0 File ThreadedTransfer.cpp, Line 212
conversion idle, stopping reader
15:34:18 #17 CDR -201 File WriterStatus.cpp, Line 162
Invalid writestate
15:34:18 #18 TRANSFER -18 File WriterStatus.cpp, Line 162
Could not perform EndTrack
15:34:27 #19 SCSI -1039 File Cdrdrv.cpp, Line 1144
SCSI Exec, HA 2, TA 1, LUN 0
Status: 0x04 (0x01, SCSI_ERR)
HA-Status 0x00 (0x00, OK)
TA-Status 0x02 (0x01, SCSI_TASTATUS_CHKCOND)
Sense ###: 0x04 (###_HARDWARE_ERROR)
Sense Code: 0x09
Sense Qual: 0x01
CDB Data: 0x5B 0x00 0x02 0x00 0x00 0x00 0x00 0x00 0x00 0x00
Sense Data: 0x70 0x00 0x04 0xD1 0xC0 0x00 0x00 0x0A
0x00 0x00 0x00 0x00 0x09 0x01
15:34:27 #20 mmc -1039 File WriterStatus.cpp, Line 201
Focus or tracking error
15:34:27 #21 TRANSFER -19 File WriterStatus.cpp, Line 201
Could not perform Fixation
15:34:27 #22 Text 0 File WriterStatus.cpp, Line 210
falling back to disc fixation
15:38:31 #23 Phase 38 File dlgbrnst.cpp, Line 1353
Burn process failed at 1x (150 KB/s)
15:38:31 #24 Text 0 File Scsicmd.cpp, Line 371
SCSI not using temporary buffers
20 out of 20 temporary buffers allocated
All help much appreciated.