Accès à internet impossible

Bonjour,

J'ai un souci assez bizare
Sur mon réseau j'ai certain de mes ordinateurs qui ne se connectent plus à internet du moins il la connexion est bien active (ping et tarcert ok) mais il est impossibel d'ouvrir des pages web quelque soit le navigateur.
chose étrange, les clients de messagerie instantanées skype hotmail et suaf yahoo (sur certain postes) se connectent sans pb.

les differnets scans fait avec Kaspersky et autre antitrojan et malware ne me donnent rein de concluant.

je présume que c'est un virus vu les sujets que j'ai lu
mais impossible de savoir comment le neutraliser.
si quelqu'un pue me donner un coup de main merci

je vous poste mon fichier Hijackthis
mes config:
config Windows 7/xp/2008 standard /

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 16:53:31, on 20/12/2011
Platform: Unknown Windows (WinNT 6.01.3504)
MSIE: Internet Explorer v9.00 (9.00.8112.16421)
Boot mode: Normal

Running processes:
C:\Windows\PixArt\PAC207\Monitor.exe
C:\Program Files (x86)\Common Files\Nero\Lib\NMIndexStoreSvr.exe
C:\Program Files (x86)\Common Files\InstallShield\UpdateService\ISUSPM.exe
C:\Program Files (x86)\Yahoo!\Search Protection\SearchProtection.exe
C:\Program Files (x86)\HP\Digital Imaging\bin\hpqtra08.exe
C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe
C:\Program Files (x86)\AVG\AVG9\avgtray.exe
C:\Program Files\Alwil Software\Avast5\AvastUI.exe
C:\Program Files (x86)\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations MP4\avp.exe
C:\Program Files (x86)\Stardock\ObjectDock\ObjectDock.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Microsoft Office\Office14\OUTLOOK.EXE
D:\compile logiciels\Anti rootkit\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://fr.msn.com/?ocid=OIE9HP
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://fr.msn.com/?ocid=OIE9HP
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://fr.msn.com/?ocid=OIE9HP
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://fr.msn.com/?ocid=OIE9HP
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Internet Explorer, optimized for Bing and MSN
F2 - REG:system.ini: UserInit=C:\Windows\SysWOW64\Userinit.exe,
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files (x86)\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: WormRadar.com IESiteBlocker.NavFilter - {3CA2F312-6F6E-4B53-A66E-4E65E497C8C0} - C:\Program Files (x86)\AVG\AVG9\avgssie.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: Groove GFS Browser Helper - {72853161-30C5-4D22-B7F9-0BBC1D38A37E} - C:\PROGRA~2\MICROS~1\Office14\GROOVEEX.DLL
O2 - BHO: Programme d'aide de l'Assistant de connexion Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: SkypeIEPluginBHO - {AE805869-2E5C-4ED4-8F7B-F1F7851A4497} - C:\Program Files (x86)\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O2 - BHO: URLRedirectionBHO - {B4F3A835-0E21-4959-BA22-42B3008E02FF} - C:\PROGRA~2\MICROS~1\Office14\URLREDIR.DLL
O2 - BHO: Ask Toolbar BHO - {D4027C7F-154A-4066-A1AD-4243D8127440} - C:\Program Files (x86)\Ask.com\GenericAskToolbar.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files (x86)\Java\jre6\bin\jp2ssv.dll
O2 - BHO: Bandoo IE Plugin - {EB5CEE80-030A-4ED8-8E20-454E9C68380F} - C:\Program Files (x86)\Bandoo\Plugins\IE\ieplugin.dll
O2 - BHO: SingleInstance Class - {FDAD4DA1-61A2-4FD8-9C17-86F7AC245081} - C:\Program Files (x86)\Yahoo!\Companion\Installs\cpn\YTSingleInstance.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files (x86)\Yahoo!\Companion\Installs\cpn\yt.dll
O3 - Toolbar: Ask Toolbar - {D4027C7F-154A-4066-A1AD-4243D8127440} - C:\Program Files (x86)\Ask.com\GenericAskToolbar.dll
O4 - HKLM\..\Run: [YSearchProtection] "C:\Program Files (x86)\Yahoo!\Search Protection\SearchProtection.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files (x86)\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [Adobe ARM] "C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [AVG9_TRAY] C:\PROGRA~2\AVG\AVG9\avgtray.exe
O4 - HKLM\..\Run: [avast5] "C:\Program Files\Alwil Software\Avast5\avastUI.exe" /nogui
O4 - HKLM\..\Run: [BCSSync] "C:\Program Files (x86)\Microsoft Office\Office14\BCSSync.exe" /DelayServices
O4 - HKLM\..\Run: [AVP] "C:\Program Files (x86)\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations MP4\avp.exe"
O4 - HKCU\..\Run: [IndxStoreSvr_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Program Files (x86)\Common Files\Nero\Lib\NMIndexStoreSvr.exe" ASO-616B5711-6DAE-4795-A05F-39A1E5104020
O4 - HKCU\..\Run: [ISUSPM] "C:\Program Files (x86)\Common Files\InstallShield\UpdateService\ISUSPM.exe" -scheduler
O4 - HKCU\..\Run: [Sidebar] C:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O4 - HKCU\..\Run: [Search Protection] C:\Program Files (x86)\Yahoo!\Search Protection\SearchProtection.exe
O4 - HKCU\..\Run: [EPSON Stylus SX400 Series (Copie 1)] C:\Windows\system32\spool\DRIVERS\x64\3\E_IATIEGE.EXE /FU "C:\Users\ADMINI~2\AppData\Local\Temp\E_S22B6.tmp" /EF "HKCU"
O4 - HKCU\..\Run: [RESTART_STICKY_NOTES] C:\Windows\System32\StikyNot.exe
O4 - HKCU\..\Run: [SUPERAntiSpyware] C:\Program Files\SUPERAntiSpyware\SUPERAntiSpyware.exe
O4 - HKCU\..\Run: [AROReminder] C:\Program Files (x86)\ARO 2011\ARO.exe -rem
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-19\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-20\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'SERVICE RÉSEAU')
O4 - Startup: Stardock ObjectDock.lnk = C:\Program Files (x86)\Stardock\ObjectDock\ObjectDock.exe
O4 - Global Startup: Aura.lnk = C:\Windows\8 Skin Pack\Aura\Aura.exe
O4 - Global Startup: DataKeeper.lnk = C:\Program Files (x86)\PowerQuest\DataKeeper 5.0\DataKeeper.exe
O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Program Files (x86)\HP\Digital Imaging\bin\hpqtra08.exe
O4 - Global Startup: TaskbarUserTile.lnk = C:\Windows\8 Skin Pack\TaskbarUserTile\UserTile.exe
O4 - Global Startup: Trojan Guarder Gold Version.lnk = C:\Program Files (x86)\Trojan Guarder Gold Version\Trojan Guarder.exe
O8 - Extra context menu item: Add to Anti-Banner - C:\Program Files (x86)\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations MP4\ie_banner_deny.htm
O9 - Extra button: Web Anti-Virus statistics - {1F460357-8A94-4D71-9CA3-AA4ACF32ED8E} - C:\Program Files (x86)\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations MP4\scieplgn.dll
O9 - Extra button: Envoyer à OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\Program Files (x86)\Microsoft Office\Office14\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: &Envoyer à OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\Program Files (x86)\Microsoft Office\Office14\ONBttnIE.dll
O9 - Extra button: Notes &liées OneNote - {789FE86F-6FC4-46A1-9849-EDE0DB0C95CA} - C:\Program Files (x86)\Microsoft Office\Office14\ONBttnIELinkedNotes.dll
O9 - Extra 'Tools' menuitem: Notes &liées OneNote - {789FE86F-6FC4-46A1-9849-EDE0DB0C95CA} - C:\Program Files (x86)\Microsoft Office\Office14\ONBttnIELinkedNotes.dll
O9 - Extra button: Skype Click to Call - {898EA8C8-E7FF-479B-8935-AEC46303B9E5} - C:\Program Files (x86)\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O9 - Extra 'Tools' menuitem: Skype Click to Call - {898EA8C8-E7FF-479B-8935-AEC46303B9E5} - C:\Program Files (x86)\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O13 - Gopher Prefix:
O17 - HKLM\System\CCS\Services\Tcpip\Parameters: Domain = anac-gabon.lan
O17 - HKLM\System\CS1\Services\Tcpip\Parameters: Domain = anac-gabon.lan
O17 - HKLM\System\CS2\Services\Tcpip\Parameters: Domain = anac-gabon.lan
O18 - Protocol: linkscanner - {F274614C-63F8-47D5-A4D1-FBDDE494F8D1} - C:\Program Files (x86)\AVG\AVG9\avgpp.dll
O18 - Protocol: skype-ie-addon-data - {91774881-D725-4E58-B298-07617B9B86A8} - C:\Program Files (x86)\Skype\Toolbars\Internet Explorer\skypeieplugin.dll
O18 - Filter hijack: text/xml - {807573E5-5146-11D5-A672-00B0D022E945} - C:\Program Files (x86)\Common Files\Microsoft Shared\OFFICE14\MSOXMLMF.DLL
O23 - Service: SAS Core Service (!SASCORE) - SUPERAntiSpyware.com - C:\Program Files\SUPERAntiSpyware\SASCORE64.EXE
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\Windows\System32\alg.exe (file missing)
O23 - Service: avast! Antivirus - AVAST Software - C:\Program Files\Alwil Software\Avast5\AvastSvc.exe
O23 - Service: avast! Mail Scanner - AVAST Software - C:\Program Files\Alwil Software\Avast5\AvastSvc.exe
O23 - Service: avast! Web Scanner - AVAST Software - C:\Program Files\Alwil Software\Avast5\AvastSvc.exe
O23 - Service: AVG Free WatchDog (avg9wd) - AVG Technologies CZ, s.r.o. - C:\Program Files (x86)\AVG\AVG9\avgwdsvc.exe
O23 - Service: Kaspersky Anti-Virus 6.0 (AVP) - Kaspersky Lab - C:\Program Files (x86)\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations MP4\avp.exe
O23 - Service: Bandoo Coordinator - Bandoo Media Inc. - C:\Program Files (x86)\Bandoo\Bandoo.exe
O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - C:\Windows\System32\lsass.exe (file missing)
O23 - Service: EnterpriseDB ApachePHP (EnterpriseDBApachePHP) - Apache Software Foundation - C:\Program Files (x86)\PostgreSQL\EnterpriseDB-ApachePhp\apache\bin\httpd.exe
O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - C:\Windows\system32\fxssvc.exe (file missing)
O23 - Service: Service Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: Service Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: HP LaserJet Service - HP - C:\Program Files (x86)\HP\HPLaserJetService\HPLaserJetService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files (x86)\Common Files\InstallShield\Driver\1150\Intel 32\IDriverT.exe
O23 - Service: @%windir%\system32\inetsrv\iisres.dll,-30007 (IISADMIN) - Unknown owner - C:\Windows\system32\inetsrv\inetinfo.exe (file missing)
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: Kaspersky Lab Network Agent (klnagent) - Kaspersky Lab ZAO - C:\Program Files (x86)\Kaspersky Lab\NetworkAgent 8\klnagent.exe
O23 - Service: Ma-Config Service (maconfservice) - CybelSoft - C:\Program Files\ma-config.com\x64\maconfservice.exe
O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - C:\Windows\System32\msdtc.exe (file missing)
O23 - Service: Nero BackItUp Scheduler 3 - Nero AG - C:\Program Files (x86)\Nero\Nero8\Nero BackItUp\NBService.exe
O23 - Service: @%SystemRoot%\System32\netlogon.dll,-102 (Netlogon) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: NMIndexingService - Nero AG - C:\Program Files (x86)\Common Files\Nero\Lib\NMIndexingService.exe
O23 - Service: PLFlash DeviceIoControl Service - Prolific Technology Inc. - C:\Windows\SysWOW64\IoctlSvc.exe
O23 - Service: @%systemroot%\system32\psbase.dll,-300 (ProtectedStorage) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: Remote Packet Capture Protocol v.0 (experimental) (rpcapd) - CACE Technologies, Inc. - C:\Program Files (x86)\WinPcap\rpcapd.exe
O23 - Service: @%systemroot%\system32\Locator.exe,-2 (RpcLocator) - Unknown owner - C:\Windows\system32\locator.exe (file missing)
O23 - Service: @%SystemRoot%\system32\samsrv.dll,-1 (SamSs) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%SystemRoot%\system32\snmptrap.exe,-3 (SNMPTRAP) - Unknown owner - C:\Windows\System32\snmptrap.exe (file missing)
O23 - Service: @%systemroot%\system32\spoolsv.exe,-1 (Spooler) - Unknown owner - C:\Windows\System32\spoolsv.exe (file missing)
O23 - Service: @%SystemRoot%\system32\sppsvc.exe,-101 (sppsvc) - Unknown owner - C:\Windows\system32\sppsvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - C:\Windows\system32\UI0Detect.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vaultsvc.dll,-1003 (VaultSvc) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%SystemRoot%\system32\vds.exe,-100 (vds) - Unknown owner - C:\Windows\System32\vds.exe (file missing)
O23 - Service: @%systemroot%\system32\vssvc.exe,-102 (VSS) - Unknown owner - C:\Windows\system32\vssvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\Wat\WatUX.exe,-601 (WatAdminSvc) - Unknown owner - C:\Windows\system32\Wat\WatAdminSvc.exe (file missing)
O23 - Service: @%systemroot%\system32\wbengine.exe,-104 (wbengine) - Unknown owner - C:\Windows\system32\wbengine.exe (file missing)
O23 - Service: @%Systemroot%\system32\wbem\wmiapsrv.exe,-110 (wmiApSrv) - Unknown owner - C:\Windows\system32\wbem\WmiApSrv.exe (file missing)
O23 - Service: @%PROGRAMFILES%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - C:\Program Files (x86)\Windows Media Player\wmpnetwk.exe (file missing)