Probleme de gravure avec nero 7

Bonjour,
j'ai actuellement un serieux problème de gravure.
à peu pres 8 fois sur 10 mes gravures échouent.
j'utilise nero 7 et je possède le lecteur graveur MATSHITA DVD-RAM UJ-860 SATA
les cd-r que j'utilise ont une vitesse allant jusqu'à 52x
mon pc est un asus intel core 2duo T8100 2.1GHz 4Go de mémoire vive et je tourne sous vista.

voici le rapport d'erreur que nero m'envoie après l'echec:

4C85-2017-4045-0001-0009-7640-0800-1400-0000-4049-233C-**** (*)

Windows XP 6.0
IA32
WinAspi: -

NT-SPTI used
Nero Version: 7.9.6.2
Internal Version: 7, 9, 6, 2
(Nero Express)
Recorder: <MATSHITA DVD-RAM UJ-860S>Version: 1.00 - HA 1 TA 0 - 7.9.6.2
Adapter driver: <IDE> HA 1
Drive buffer : 2048kB
Bus Type : via Inquiry data (1) -> ATAPI, detected: ?
Connected to MMC as unknown drive with class-nr : 1
Drive is autodetected - recorder class: Std. MMC recorder
CD-ROM: <MATSHITA DVD-RAM UJ-860S >Version: 1.00 - HA 1 TA 0 - 7.9.6.2
Adapter driver: <IDE> HA 1

=== Scsi-Device-Map ===
DiskPeripheral : ST9250827AS iaStor Port 0 ID 0 DMA: On
DiskPeripheral : ST9250827AS iaStor Port 0 ID 1 DMA: Off
CdRomPeripheral : VN3547P PJZ892J 1.01 adgfpgnq Port 4 ID 0 DMA: Off
CdRomPeripheral : VN3547P PJZ892J 1.01 adgfpgnq Port 4 ID 1 DMA: Off

=== CDRom-Device-Map ===
MATSHITA DVD-RAM UJ-860S G: CdRom0
VN3547P PJZ892J H: CdRom1
VN3547P PJZ892J I: CdRom2
=======================

AutoRun : 1
Excluded drive IDs:
WriteBufferSize: 83886080 (0) Byte
BUFE : 0
Physical memory : 2047MB (2097151kB)
Free physical memory: 1199MB (1228000kB)
Memory in use : 60 %
Uncached PFiles: 0x0
Use Inquiry : 1
Global Bus Type: default (0)
Check supported media : Disabled (0)

29.8.2008
CD-ROM (ISO)
00:34:40 #1 Text 0 File SCSIPTICommands.cpp, Line 424
LockMCN - completed sucessfully for IOCTL_STORAGE_MCN_CONTROL

00:34:40 #2 Text 0 File Isodoc.cpp, Line 6663
Iso document burn settings
------------------------------------------
Determine maximum speed : FALSE
Simulate : FALSE
Write : TRUE
Finalize CD : TRUE
Multisession : FALSE
Burning mode : TAO
Mode : 1
ISO Level : 1 (Max. of 11 = 8 + 3 char)
Character set : ISO 9660
Joliet : TRUE
Allow pathdepth more than 8 directories : TRUE
Allow more than 255 characters in path : TRUE
Write ISO9660 ;1 file extensions : TRUE

00:34:40 #3 Text 0 File Burncd.cpp, Line 3196
MATSHITA DVD-RAM UJ-860S
Protection contre les ruptures activés

00:34:40 #4 ISO9660GEN -11 File Geniso.cpp, Line 3343
First writeable address = 0 (0x00000000)

00:34:40 #5 Text 0 File Burncd.cpp, Line 3508
Turn on Track-At-Once, using CD-R/RW media

00:34:40 #6 Text 0 File DlgWaitCD.cpp, Line 307
Last possible write address on media: 359848 ( 79:59.73)
Last address to be written: 356223 ( 79:11.48)

00:34:40 #7 Text 0 File DlgWaitCD.cpp, Line 319
Write in overburning mode: NO (enabled: CD)

00:34:40 #8 Text 0 File DlgWaitCD.cpp, Line 2964
Recorder: MATSHITA DVD-RAM UJ-860S;
CDR code: 00 97 27 18; OSJ entry from: Plasmon Data systems Ltd.
ATIP Data:
Special Info [hex] 1: D0 00 A0, 2: 61 1B 12 (LI 97:27.18), 3: 4F 3B 4A (LO 79:59.74)
Additional Info [hex] 1: 00 00 00 (invalid), 2: 00 00 00 (invalid), 3: 00 00 00 (invalid)

00:34:40 #9 Text 0 File DlgWaitCD.cpp, Line 493
>>> Protocol of DlgWaitCD activities: <<<
=========================================

00:34:40 #10 Text 0 File ThreadedTransferInterface.cpp, Line 793
Setup items (after recorder preparation)
0: TRM_DATA_MODE1 ()
2 indices, index0 (150) not provided
original disc pos #0 + 356224 (356224) = #356224/79:9.49
relocatable, disc pos for caching/writing not required/ required
-> TRM_DATA_MODE1, 2048, config 0, wanted index0 0 blocks, length 356222 blocks [G: MATSHITA DVD-RAM UJ-860S]
--------------------------------------------------------------

00:34:40 #11 Text 0 File ThreadedTransferInterface.cpp, Line 995
Prepare [G: MATSHITA DVD-RAM UJ-860S] for write in TAO
DAO infos:
==========
MCN: ""
TOCType: 0x00; Session Closed, disc fixated
Tracks 1 to 1: Idx 0 Idx 1 Next Trk
1: TRM_DATA_MODE1, 2048/0x00, FilePos 0 307200 729853952, ISRC ""
DAO layout:
===========
___Start_|____Track_|_Idx_|_CtrlAdr_|_____Size_|______NWA_|_RecDep__________
-150 | lead-in | 0 | 0x41 | 0 | 0 | 0x00
-150 | 1 | 0 | 0x41 | 0 | 0 | 0x00
0 | 1 | 1 | 0x41 | 356224 | 0 | 0x00
356224 | lead-out | 1 | 0x41 | 0 | 0 | 0x00

00:34:40 #12 Text 0 File ThreadedTransferInterface.cpp, Line 1066
Removed 2 run-out blocks from end of track 1. Length: 356224 -> 356222.

00:34:40 #13 Text 0 File SCSIPTICommands.cpp, Line 215
SPTILockVolume - completed successfully for FSCTL_LOCK_VOLUME

00:34:40 #14 Text 0 File Burncd.cpp, Line 4294
Caching options: cache CDRom or Network-Yes, small files-Yes (<64KB)

00:34:40 #15 Phase 24 File dlgbrnst.cpp, Line 1762
Caching of files started

00:34:40 #16 Text 0 File Burncd.cpp, Line 4413
Cache writing successful.

00:34:40 #17 Phase 25 File dlgbrnst.cpp, Line 1762
Caching of files completed

00:34:40 #18 Phase 36 File dlgbrnst.cpp, Line 1762
Burn process started at 24x (3 600 Ko/s)

00:34:40 #19 Text 0 File ThreadedTransferInterface.cpp, Line 2721
Verifying disc position of item 0 (relocatable, disc pos, no patch infos, orig at #0): write at #0

00:34:40 #20 Text 0 File MMC.cpp, Line 22363
Set BUFE: Buffer underrun protection -> ON

00:34:40 #21 Text 0 File ThreadedTransfer.cpp, Line 269
Pipe memory size 83836800

00:37:16 #22 SPTI -1 File SCSIPassThrough.cpp, Line 179
CdRom0: SCSIStatus(x02) WinError(0) NeroError(-1)
Sense Key: 0x04 (KEY_HARDWARE_ERROR)
Sense Code: 0x03
Sense Qual: 0x01
CDB Data: 0x2A 00 00 02 6F 00 00 00 20 00 00 00
Sense Area: 0xF1 00 04 00 02 6C 82 0A 00 32 00 13 03 01
Buffer x0c8c1fc0: Len x10000
0x3C 4C 28 4F BA 2E BF 6C 84 F5 7A 7C 54 0C 6A D6
0x08 94 34 43 FF B5 08 93 C0 CD 48 E5 AA 67 C8 23
0xD2 0A C1 0A 7C 66 10 D8 CA 31 8C 64 32 B1 92 24

00:37:16 #23 CDR -1 File Writer.cpp, Line 303
Unspecified Recorder Error
G: MATSHITA DVD-RAM UJ-860S

00:37:16 #24 CDR -201 File WriterStatus.cpp, Line 195
Invalid write state
G: MATSHITA DVD-RAM UJ-860S

00:37:16 #25 TRANSFER -18 File WriterStatus.cpp, Line 195
Could not perform EndTrack

00:37:16 #26 Text 0 File MMC.cpp, Line 17131
<MATSHITADVD-RAM UJ-860S > start Close Session

00:37:56 #27 Phase 38 File dlgbrnst.cpp, Line 1762
Burn process failed at 24x (3 600 Ko/s)

00:37:56 #28 Text 0 File SCSIPTICommands.cpp, Line 261
SPTIDismountVolume - completed successfully for FSCTL_DISMOUNT_VOLUME

00:38:00 #29 Text 0 File Cdrdrv.cpp, Line 11185
DriveLocker: UnLockVolume completed

00:38:00 #30 Text 0 File SCSIPTICommands.cpp, Line 424
UnLockMCN - completed sucessfully for IOCTL_STORAGE_MCN_CONTROL


Existing drivers:

Registry Keys:
HKLM\Software\Microsoft\Windows NT\CurrentVersion\WinLogon

___________________________________________________________

voila je crois que j'ai à peu près tout dis
je comprend vraiment pas ce qu'il se passe
merci par avance pour votre aide ;)