Windows Live Messenger ne démarre plus + pubs

Bonjour,
Voila depuis hier j'ai un problème sur mon PC : Lorsque je veux lancer Windows Live Messenger, celui-ci n'apparaît pas dans la barre des tâches, néanmoins il est tout de même en marche, vu qu'en consultant le Gestionnaire des tâches, onglet Processus, msnmsgr.exe apparaît, c'est pourquoi je soupçonne un virus ou un spyware. J'ai aussi remarqué l'apparition de pubs sur Firefox depuis quelques semaines, quand je vais sur des sites (n'importe lesquels, blogs d'amis par exemple), une pub s'affiche pour des logiciels soi-disant "anti-spywares", tels DriveCleaner et autres... et je me demande si les deux ne sont liés ! Mais je ne trouve rien après analyse avec mon anti-virus (McAfee), une analyse AVG Anti-Spyware, et une analyse Spybot. Donc si quelqu'un à la solution à mon problème... il est bienvenu. Je précise que Windows Live Messenger marche tout à fait normalement sur les autres sessions de mon ordinateur, seule la mienne semble touchée. Ci-contre mon log hijackthis, qui sera utile je pense :

Logfile of HijackThis v1.99.1
Scan saved at 17:26:09, on 10/09/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

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:\PROGRA~1\FICHIE~1\AOL\ACS\AOLacsd.exe
C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
C:\Program Files\Home Cinema\PowerCinema\Kernel\TV\CLCapSvc.exe
C:\WINDOWS\system32\CTsvcCDA.EXE
C:\Program Files\Home Cinema\PowerCinema\Kernel\CLML_NTService\CLMLServer.exe
C:\Program Files\Fichiers communs\McAfee\HackerWatch\HWAPI.exe
C:\PROGRA~1\McAfee\MSC\mcmscsvc.exe
c:\program files\fichiers communs\mcafee\mna\mcnasvc.exe
C:\PROGRA~1\McAfee\VIRUSS~1\mcods.exe
C:\PROGRA~1\McAfee\MSC\mcpromgr.exe
c:\PROGRA~1\FICHIE~1\mcafee\redirsvc\redirsvc.exe
C:\PROGRA~1\McAfee\VIRUSS~1\mcshield.exe
C:\PROGRA~1\McAfee\VIRUSS~1\mcsysmon.exe
C:\Program Files\McAfee\MPF\MPFSrv.exe
C:\Program Files\Stardock\Object Desktop\ThemeManager\wbload.exe
C:\WINDOWS\Explorer.EXE
c:\PROGRA~1\mcafee.com\agent\mcagent.exe
C:\Program Files\Home Cinema\PowerCinema\PCMService.exe
C:\Program Files\Labtec\moffice.exe
C:\WINDOWS\zHotkey.exe
C:\Program Files\Adobe\Photoshop Album Edition Découverte\3.0\Apps\apdproxy.exe
C:\Program Files\Sony Ericsson\Mobile2\Application Launcher\Application Launcher.exe
C:\Program Files\Labtec\MOUSE32A.DAT
C:\Program Files\SiteAdvisor\6172\SiteAdv.exe
C:\Program Files\Creative\Sync Manager Unicode\CTSyncU.exe
C:\Program Files\Fichiers communs\Teleca Shared\CapabilityManager.exe
C:\Program Files\Siemens\SANTIS WLAN\WlanMonitor.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\Program Files\CyberLink\Shared Files\RichVideo.exe
C:\Program Files\SiteAdvisor\6172\SAService.exe
C:\Program Files\Alcohol Soft\Alcohol 120\StarWind\StarWindService.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\wanmpsvc.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Home Cinema\PowerCinema\Kernel\TV\CLSched.exe
C:\PROGRA~1\COMMON~1\X10\Common\x10nets.exe
C:\Program Files\Fichiers communs\Teleca Shared\Generic.exe
C:\Program Files\Sony Ericsson\Mobile\Mobile Phone Monitor\epmworker.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Program Files\Windows Media Player\wmplayer.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://outlook.live.com/owa/
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://192.168.1.1/ServicesAcces.html
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {089FD14D-132B-48FC-8861-0048AE113215} - C:\Program Files\SiteAdvisor\6172\SiteAdv.dll
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: scriptproxy - {7DB2D5A0-7241-4E79-B68D-6309F01C5231} - c:\program files\mcafee\virusscan\scriptcl.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O3 - Toolbar: Easy-WebPrint - {327C2873-E90D-4c37-AA9D-10AC9BABA46C} - C:\Program Files\Canon\Easy-WebPrint\Toolband.dll
O3 - Toolbar: McAfee SiteAdvisor - {0BF43445-2F28-4351-9252-17FE6E806AA0} - C:\Program Files\SiteAdvisor\6172\SiteAdv.dll
O4 - HKLM\..\Run: [PCMService] "C:\Program Files\Home Cinema\PowerCinema\PCMService.exe"
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [FLMOFFICE4DMOUSE] C:\Program Files\Labtec\moffice.exe
O4 - HKLM\..\Run: [CHotkey] zHotkey.exe
O4 - HKLM\..\Run: [Adobe Photo Downloader] "C:\Program Files\Adobe\Photoshop Album Edition Découverte\3.0\Apps\apdproxy.exe"
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\K-Lite Codec Pack\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [Easy-PrintToolBox] C:\Program Files\Canon\Easy-PrintToolBox\BJPSMAIN.EXE /logon
O4 - HKLM\..\Run: [Sony Ericsson PC Suite] "C:\Program Files\Sony Ericsson\Mobile2\Application Launcher\Application Launcher.exe" /startoptions
O4 - HKLM\..\Run: [SiteAdvisor] C:\Program Files\SiteAdvisor\6172\SiteAdv.exe
O4 - HKCU\..\Run: [CTSyncU.exe] "C:\Program Files\Creative\Sync Manager Unicode\CTSyncU.exe"
O4 - Global Startup: SANTIS USB and PC Card Utility.lnk = C:\Program Files\Siemens\SANTIS WLAN\WlanMonitor.exe
O4 - Global Startup: WlanUtility.lnk = C:\Program Files\MicroStar\WLANUtility\WlanUtility.exe
O8 - Extra context menu item: &Recherche AOL Toolbar - res://C:\Program Files\AOL Toolbar\toolbar.dll/SEARCH.HTML
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_05\bin\npjpi150_05.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_05\bin\npjpi150_05.dll
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
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
O16 - DPF: {0EB0E74A-2A76-4AB3-A7FB-9BD8C29F7F75} (CKAVWebScan Object) - http://www.kaspersky.com/kos/eng/partner/default/kavwebscan_unicode.cab
O16 - DPF: {5D6F45B3-9043-443D-A792-115447494D24} (UnoCtrl Class) - http://messenger.zone.msn.com/FR-FR/a-UNO1/GAME_UNO1.cab
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsClient.cab31267.cab
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://acs.pandasoftware.com/activescan/as5free/asinst.cab
O16 - DPF: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsPAClient.cab56907.cab
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: siteadvisor - {3A5DC592-7723-4EAA-9EE6-AF4222BCF879} - C:\Program Files\SiteAdvisor\6172\SiteAdv.dll
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FICHIE~1\Skype\SKYPE4~1.DLL
O20 - Winlogon Notify: WB - C:\Program Files\Stardock\Object Desktop\ThemeManager\fastload.dll
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O23 - Service: AOL Connectivity Service (AOL ACS) - AOL LLC - C:\PROGRA~1\FICHIE~1\AOL\ACS\AOLacsd.exe
O23 - Service: AVG Anti-Spyware Guard - Anti-Malware Development a.s. - C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: CyberLink Background Capture Service (CBCS) (CLCapSvc) - Unknown owner - C:\Program Files\Home Cinema\PowerCinema\Kernel\TV\CLCapSvc.exe
O23 - Service: CyberLink Task Scheduler (CTS) (CLSched) - Unknown owner - C:\Program Files\Home Cinema\PowerCinema\Kernel\TV\CLSched.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTsvcCDA.EXE
O23 - Service: CyberLink Media Library Service - Cyberlink - C:\Program Files\Home Cinema\PowerCinema\Kernel\CLML_NTService\CLMLServer.exe
O23 - Service: McAfee E-mail Proxy (Emproxy) - McAfee, Inc. - C:\PROGRA~1\FICHIE~1\McAfee\EmProxy\emproxy.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Service de l'iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: McAfee HackerWatch Service - McAfee, Inc. - C:\Program Files\Fichiers communs\McAfee\HackerWatch\HWAPI.exe
O23 - Service: McAfee Update Manager (mcmispupdmgr) - McAfee, Inc. - C:\PROGRA~1\McAfee\MSC\mcupdmgr.exe
O23 - Service: McAfee Services (mcmscsvc) - McAfee, Inc. - C:\PROGRA~1\McAfee\MSC\mcmscsvc.exe
O23 - Service: McAfee Network Agent (McNASvc) - McAfee, Inc. - c:\program files\fichiers communs\mcafee\mna\mcnasvc.exe
O23 - Service: McAfee Scanner (McODS) - McAfee, Inc. - C:\PROGRA~1\McAfee\VIRUSS~1\mcods.exe
O23 - Service: McAfee Protection Manager (mcpromgr) - McAfee, Inc. - C:\PROGRA~1\McAfee\MSC\mcpromgr.exe
O23 - Service: McAfee Redirector Service (McRedirector) - McAfee, Inc. - c:\PROGRA~1\FICHIE~1\mcafee\redirsvc\redirsvc.exe
O23 - Service: McAfee Real-time Scanner (McShield) - McAfee, Inc. - C:\PROGRA~1\McAfee\VIRUSS~1\mcshield.exe
O23 - Service: McAfee SystemGuards (McSysmon) - McAfee, Inc. - C:\PROGRA~1\McAfee\VIRUSS~1\mcsysmon.exe
O23 - Service: McAfee Personal Firewall Service (MpfService) - McAfee, Inc. - C:\Program Files\McAfee\MPF\MPFSrv.exe
O23 - Service: MSI_WLAN_Service - Unknown owner - C:\Program Files\MicroStar\WLANUtility\WLAN_Service.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Cyberlink RichVideo Service(CRVS) (RichVideo) - Unknown owner - C:\Program Files\CyberLink\Shared Files\RichVideo.exe
O23 - Service: SiteAdvisor Service - Unknown owner - C:\Program Files\SiteAdvisor\6172\SAService.exe
O23 - Service: StarWind iSCSI Service (StarWindService) - Rocket Division Software - C:\Program Files\Alcohol Soft\Alcohol 120\StarWind\StarWindService.exe
O23 - Service: WAN Miniport (ATW) Service (WANMiniportService) - America Online, Inc. - C:\WINDOWS\wanmpsvc.exe
O23 - Service: X10 Device Network Service (x10nets) - X10 - C:\PROGRA~1\COMMON~1\X10\Common\x10nets.exe