Arrêts intempestifs

A plusieurs reprises mon PC m'a fait le coup des "arrêts intempestifs" cités souvent sur les forums, avec écran bleu avant réinstallation de windows, et depuis, sans ! Quand il ne plante pas, il "gèle" et je dois rebooter manuellement pour supprimer le bug ... qui peut se renouveler peu de temps après.
RAS sur l'analyse antivirus Kaspersky + Adaware, idem chez Spylog.
Si quelqu'un a une idée... Merci d'avance !

Ci-joint le log hijackthis + dxdiag :

Logfile of HijackThis v1.99.1
Scan saved at 00:49:26, on 15/08/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16512)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\avp.exe
C:\WINDOWS\system32\svchost.exe
C:\PROGRA~1\CLUB-I~1\LECOMP~1\SMARTB~1\MotiveSB.exe
C:\Program Files\ATI Technologies\ATI.ACE\cli.exe
C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_FATIAGE.EXE
C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\avp.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\ATI Technologies\ATI.ACE\cli.exe
C:\Program Files\ATI Technologies\ATI.ACE\cli.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\DOCUME~1\ODILE-~1\LOCALS~1\Temp\Répertoire temporaire 1 pour hijackthis_199.zip\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://actus.sfr.fr
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Internet Explorer avec Club-Internet
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = 127.0.0.1
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: Aide pour le lien d'Adobe PDF Reader - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Fichiers communs\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {243B17DE-77C7-46BF-B94B-0B5F309A0E64} - C:\Program Files\Microsoft Money\System\mnyside.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar2.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\2.0.301.7164\swg.dll
O2 - BHO: (no name) - {FDD3B846-8D59-4ffb-8758-209B6AD74ACC} - (no file)
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O4 - HKLM\..\Run: [Motive SmartBridge] C:\PROGRA~1\CLUB-I~1\LECOMP~1\SMARTB~1\MotiveSB.exe
O4 - HKLM\..\Run: [ATICCC] "C:\Program Files\ATI Technologies\ATI.ACE\cli.exe" runtime -Delay
O4 - HKLM\..\Run: [EPSON Stylus Photo RX520 Series] C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_FATIAGE.EXE /P31 "EPSON Stylus Photo RX520 Series" /O6 "USB001" /M "Stylus Photo RX520"
O4 - HKLM\..\Run: [AVP] "C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\avp.exe"
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [swg] C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - Global Startup: Adobe Reader Synchronizer.lnk = C:\Program Files\Adobe\Reader 8.0\Reader\AdobeCollabSync.exe
O4 - Global Startup: Lancement rapide d'Adobe Reader.lnk = C:\Program Files\Adobe\Reader 8.0\Reader\reader_sl.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O8 - Extra context menu item: Ajouter à Kaspersky Anti-Banner - C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\ie_banner_deny.htm
O9 - Extra button: Statistiques d’Anti-Virus Internet - {1F460357-8A94-4D71-9CA3-AA4ACF32ED8E} - C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\scieplugin.dll
O9 - Extra button: MoneySide - {E023F504-0C5A-4750-A1E7-A9046DEA8A21} - C:\Program Files\Microsoft Money\System\mnyside.dll
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O11 - Options group: [INTERNATIONAL] International*
O16 - DPF: {0EB0E74A-2A76-4AB3-A7FB-9BD8C29F7F75} (CKAVWebScan Object) - https://www.kaspersky.fr/?domain=webscanner.kaspersky.fr
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://www.update.microsoft.com/...
O16 - DPF: {B9907873-6560-4A36-B76B-9DADE84A7F55} (FnacmusicDnl.DnlManager) - http://www.fnacmusic.com/telechargementFnacmusic/FnacmusicDnl.CAB
O20 - AppInit_DLLs: C:\PROGRA~1\KASPER~1\KASPER~1.0\adialhk.dll,C:\PROGRA~1\KASPER~1\KASPER~2.0\adialhk.dll
O20 - Winlogon Notify: klogon - C:\WINDOWS\system32\klogon.dll
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: Kaspersky Internet Security 6.0 (AVP) - Unknown owner - C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0\avp.exe" -r (file missing)
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe

DX DIAG :

------------------
System Information
------------------
Time of this report: 8/15/2007, 01:08:08
Machine name: OCG
Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.070227-2254)
Language: French (Regional Setting: French)
System Manufacturer: A7N8X
System Model: A7N8X016
BIOS: BIOS Date: 08/31/04 15:16:47 Ver: 08.00.08
Processor: AMD Athlon(tm) XP 2600+, MMX, 3DNow, ~2.1GHz
Memory: 1024MB RAM
Page File: 356MB used, 2105MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.2180 32bit Unicode

---------------
Display Devices
---------------
Card name: RADEON 9200 SERIES
Manufacturer: ATI Technologies Inc.
Chip type: RADEON 9250/9200 Series AGP (0x5961)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_5961&SUBSYS_20021002&REV_01
Display Memory: 128.0 MB
Current Mode: 1152 x 864 (32 bit) (70Hz)
Monitor: Écran Plug-and-Play
Monitor Max Res: 1600,1200
Driver Name: ati2dvag.dll
Driver Version: 6.14.0010.6614 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 5/3/2006 18:51:00, 258048 bytes
WHQL Logo'd: Yes
WHQL Date Stamp: n/a
VDD: n/a
Mini VDD: ati2mtag.sys
Mini VDD Date: 5/3/2006 18:50:42, 1540608 bytes
Device Identifier: {D7B71EE2-1A21-11CF-646A-0800A0C2CB35}

AGP Status: Not Available

-------------
Sound Devices
-------------
Description: Realtek AC97 Audio
Driver Name: ALCXWDM.SYS
Driver Version: 5.10.0000.6240 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 4/25/2007 16:20:48, 4030144 bytes
---------------------