Windows explorer se bloque

Bonjour,

de maniere intempestive, windows explorer se bloque des que je clique sur un fichier pour l ouvrir. Je dois faire alt ctrl del pour ouvriir task manager, forcer la fermeture de windows explorer. et Ca remarche a nouveau jusqu a la prochaine fois:

Voici un log Hijackthis

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 9:18:00 AM, on 12/1/2008
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16735)
Boot mode: Normal

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\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Avira\AntiVir PersonalEdition Classic\sched.exe
C:\Program Files\Avira\AntiVir PersonalEdition Classic\avguard.exe
C:\Program Files\Java\jre6\bin\jqs.exe
C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\WINDOWS\system32\nvsvc32.exe
C:\Program Files\Compact Wireless-G USB Adapter Wireless Network Monitor\WLService.exe
C:\Program Files\Compact Wireless-G USB Adapter Wireless Network Monitor\WUSB54GC.exe
C:\Program Files\Avira\AntiVir PersonalEdition Classic\avgnt.exe
C:\WINDOWS\RTHDCPL.EXE
C:\Program Files\Java\jre6\bin\jusched.exe
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\WINDOWS\system32\rundll32.exe
C:\Program Files\Adobe\Acrobat 5.0\Distillr\AcroTray.exe
C:\Program Files\TechSmith\SnagIt 8\SnagIt32.exe
C:\Program Files\TechSmith\SnagIt 8\TSCHelp.exe
C:\Program Files\TechSmith\SnagIt 8\SnagPriv.exe
C:\WINDOWS\explorer.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Star Downloader\stardown.exe
C:\Program Files\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://search.conduit.com?SearchSource=10&ctid=CT2004604
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = https://www.msn.com/fr-fr/?ocid=iehp
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
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.msn.com/fr-fr/?ocid=iehp
R3 - URLSearchHook: Peer2Peer-FR Toolbar - {b00f3d7d-ecad-4a3b-bcf7-ba5fc1fd0f8d} - C:\Program Files\Peer2Peer-FR\tbPee0.dll
O2 - BHO: SnagIt Toolbar Loader - {00C6482D-C502-44C8-8409-FCE54AD9C208} - C:\Program Files\TechSmith\SnagIt 8\SnagItBHO.dll
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Acrobat\ActiveX\AcroIEHelper.ocx
O2 - BHO: Java(tm) Plug-In SSV Helper - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre6\bin\ssv.dll
O2 - BHO: Peer2Peer-FR Toolbar - {b00f3d7d-ecad-4a3b-bcf7-ba5fc1fd0f8d} - C:\Program Files\Peer2Peer-FR\tbPee0.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O2 - BHO: JQSIEStartDetectorImpl Class - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Program Files\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O2 - BHO: (no name) - {FFFFFEF0-5B30-21D4-945D-000000000000} - C:\PROGRA~1\STARDO~1\SDIEInt.dll
O3 - Toolbar: SnagIt - {8FF5E183-ABDE-46EB-B09E-D2AAB95CABE3} - C:\Program Files\TechSmith\SnagIt 8\SnagItIEAddin.dll
O3 - Toolbar: Peer2Peer-FR Toolbar - {b00f3d7d-ecad-4a3b-bcf7-ba5fc1fd0f8d} - C:\Program Files\Peer2Peer-FR\tbPee0.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [avgnt] "C:\Program Files\Avira\AntiVir PersonalEdition Classic\avgnt.exe" /min
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre6\bin\jusched.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [NVIEW] rundll32.exe nview.dll,nViewLoadHook
O4 - HKCU\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NVMCTRAY.DLL,NvTaskbarInit
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'LOCAL SERVICE')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'NETWORK SERVICE')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'Default user')
O4 - Startup: Acrobat Assistant.lnk = C:\Program Files\Adobe\Acrobat 5.0\Distillr\AcroTray.exe
O4 - Startup: Check for TWS Updates.lnk = C:\Jts\WiseUpdt.exe
O4 - Startup: SnagIt 8.lnk = C:\Program Files\TechSmith\SnagIt 8\SnagIt32.exe
O8 - Extra context menu item: Download with Star Downloader - C:\Program Files\Star Downloader\sdie.htm
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~3\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Enqueue in Star Downloader - C:\Program Files\Star Downloader\sdieenq.htm
O8 - Extra context menu item: Leech with Star Downloader - C:\Program Files\Star Downloader\leechie.htm
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~3\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
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
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: {3DC2E31C-371A-4BD3-9A27-CDF57CE604CF} (MSN Money Charting) - https://www.msn.com/en-us/money/
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://www.update.microsoft.com/...
O16 - DPF: {8AD9C840-044E-11D1-B3E9-00805F499D93} (Java Runtime Environment 1.6.0) - http://dl8-cdn-03.sun.com/s/ESD5/JSCDL/jdk/6u10/jinstall-6u10-windows-i586-jc.cab?e=1225781419125&h=0bbc306213d2bec777a20d69df248f70/&filename=jinstall-6u10-windows-i586-jc.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{49301287-E6E8-41FD-9E34-ACA341B814D7}: NameServer = 212.27.40.240,212.27.40.241
O23 - Service: Avira AntiVir Personal – Free Antivirus Scheduler (AntiVirScheduler) - Avira GmbH - C:\Program Files\Avira\AntiVir PersonalEdition Classic\sched.exe
O23 - Service: Avira AntiVir Personal – Free Antivirus Guard (AntiVirService) - Avira GmbH - C:\Program Files\Avira\AntiVir PersonalEdition Classic\avguard.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\1150\Intel 32\IDriverT.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Program Files\Java\jre6\bin\jqs.exe
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: WUSB54GCSVC - GEMTEKS - C:\Program Files\Compact Wireless-G USB Adapter Wireless Network Monitor\WLService.exe