BSoD, ecran figé et redémarrage ...

Bonjour, depuis quelque temps je reçois des écrans bleus divers et variés. De là, j'ai fais une mise à jour de mes drivers et le problème revient ecnore... J'ai quand même très fréquemment des écrans bleus, même quand j'arrive sur l'écran de bienvenue. Mon ordinateur se fige parfois ou redémarre mais sans blue screen. Voici ma config :
Version du plugin 5.2.2.0
Version de la base 20
Date de la détection 25/02/2012 18:11
Nom de la machine Sébastien-TOSH
Modules
Système d'exploitation Windows 7 Edition Familiale Premium (x64) (build 7601) Service Pack 1
Navigateur web par défaut: Mozilla Firefox
Client e-mail par défaut: Windows Live Mail
WinSAT Note Générale 4.1 (Processeur: 4.9, Mémoire vive: 5.9, Graphiques: 4.1, Graphiques de jeu: 5, Disque dur principal: 5.6 )
Carte mère SMBios version 2.6
TOSHIBA NTWAE 1.00
Bios: TOSHIBA V1.20 11/26/2009 taille: 1024Kb
Chipset Northbridge: AMD 785GX
Southbridge: AMD SB700
Processeur AMD Athlon II M300 Caspian Socket S1 (638) (@45 nm) 2000 Mhz ( L1I: 2 x 64 Ko, L1D: 2 x 64 Ko, L2: 2 x 512 Ko )
Mémoire Mémoire physique totale: 4096 Mo, Type: DDR2, @MHz, 6.0-6-6-18-2T
DDR2 Samsung M4 70T5663EH3-CF7 2048 Mo PC2-6400 (400 Mhz) (6.0-6-6-18)
DDR2 Samsung M4 70T5663EH3-CF7 2048 Mo PC2-6400 (400 Mhz) (6.0-6-6-18)
Carte Graphique ATI Mobility Radeon 4100
Périphériques ATA TOSHIBA MK5055GSX FG001M (SATA II, 465.76 Go, Cache: 8 Mo)
Lecteurs CD/DVD DTSoftBusCd00
PIONEER DVD-RW DVRTD09A1.50
Disque dur TOSHIBA MK5055GSX SATA Disk Device
Cartes PCI/AGP Stockage
ATI Technologies Inc:SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode]:

Réseau
Realtek Semiconductor Co., Ltd.:RTL8191SEvB Wireless LAN Controller:
Realtek Semiconductor Co., Ltd.:RTL8101E/RTL8102E PCI Express Fast Ethernet controller:

Affichage
ATI Technologies Inc:M860G [Mobility Radeon 4100]:

Multimédia
ATI Technologies Inc:SBx00 Azalia (Intel HDA):

Ponts
Advanced Micro Devices [AMD]:RS880 Host Bridge:
Materiel non reconnu (V:Toshiba America Info Systems,D:0x9602)
Advanced Micro Devices [AMD]:RS780 PCI to PCI bridge (PCIE port 0)
Advanced Micro Devices [AMD]:RS780 PCI to PCI bridge (PCIE port 2)
Advanced Micro Devices [AMD]:RS780 PCI to PCI bridge (PCIE port 3)
ATI Technologies Inc:SB7x0/SB8x0/SB9x0 LPC host controller:
ATI Technologies Inc:SBx00 PCI to PCI Bridge
Advanced Micro Devices [AMD]:Family 10h Processor HyperTransport Configuration
Advanced Micro Devices [AMD]:Family 10h Processor Address Map
Advanced Micro Devices [AMD]:Family 10h Processor DRAM Controller
Advanced Micro Devices [AMD]:Family 10h Processor Miscellaneous Control
Advanced Micro Devices [AMD]:Family 10h Processor Link Control

Bus Séries
ATI Technologies Inc:SB7x0/SB8x0/SB9x0 USB OHCI0 Controller:
ATI Technologies Inc:SB7x0 USB OHCI1 Controller:
ATI Technologies Inc:SB7x0/SB8x0/SB9x0 USB EHCI Controller:
ATI Technologies Inc:SB7x0/SB8x0/SB9x0 USB OHCI0 Controller:
ATI Technologies Inc:SB7x0 USB OHCI1 Controller:
ATI Technologies Inc:SB7x0/SB8x0/SB9x0 USB EHCI Controller:
ATI Technologies Inc:SBx00 SMBus Controller:
Périphérique USB Logitech, Inc. Premium Optical Wheel Mouse (M-BT58) (Périphérique dentrée USB)
Chicony Electronics Co., Ltd Périphérique USB composite
Chicony Electronics Co., Ltd Périphérique vidéo USB
Clavier Clavier standard PS/2
Souris Souris HID
Synaptics PS/2 Port TouchPad
Ecran(s) Moniteur Plug-and-Play générique( )

Et voici ce que m'indique whocrashed :
On Sat 25/02/2012 16:56:13 GMT your computer crashed
crash dump file: C:\Windows\Minidump\022512-20482-01.dmp
This was probably caused by the following module: fltmgr.sys (fltmgr+0x48FD)
Bugcheck code: 0x3B (0xC0000005, 0xFFFFF880010B78FD, 0xFFFFF8800C557900, 0x0)
Error: SYSTEM_SERVICE_EXCEPTION
file path: C:\Windows\system32\drivers\fltmgr.sys
product: Système d'exploitation Microsoft® Windows®
company: Microsoft Corporation
description: Gestionnaire de filtres de système de fichiers Microsoft
Bug check description: This indicates that an exception happened while executing a routine that transitions from non-privileged code to privileged code.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in a standard Microsoft module. Your system configuration may be incorrect. Possibly this problem is caused by another driver on your system which cannot be identified at this time.

On Sat 25/02/2012 16:56:13 GMT your computer crashed
crash dump file: C:\Windows\memory.dmp
This was probably caused by the following module: fltmgr.sys (fltmgr!FltIsCallbackDataDirty+0x200D)
Bugcheck code: 0x3B (0xC0000005, 0xFFFFF880010B78FD, 0xFFFFF8800C557900, 0x0)
Error: SYSTEM_SERVICE_EXCEPTION
file path: C:\Windows\system32\drivers\fltmgr.sys
product: Système d'exploitation Microsoft® Windows®
company: Microsoft Corporation
description: Gestionnaire de filtres de système de fichiers Microsoft
Bug check description: This indicates that an exception happened while executing a routine that transitions from non-privileged code to privileged code.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in a standard Microsoft module. Your system configuration may be incorrect. Possibly this problem is caused by another driver on your system which cannot be identified at this time.

Ce problème devient très récurrent et hormis le formatage complet de mon cp, je ne sais plus quoi faire et encore, on dit que ca ne résous pas le problème à tous les coups, HELP! :'(