Plus de disque C: dans l'explorer

Bonjour,

Suite à l'installation d'un freeware, de nombreux messages d'alertes apparaissent sur mon Pc (tourne Windows XP).
Lorsque j'ouvre l'explorer je ne vois plus le disque c: (je peux l'atteindre sous DOS)
Dans le menu Démarrer, pratiquement toutes les options de la colonne de droite ont disparues).
Mon fond d'écran a également disparu et lorsque je fait un click droit / propriété, j'ai les propriétés de la page suivante c:\windows\privacy_danger\index.html qui s'affiche.

j'ai redémarré en mode sans échec et lancé Avira Antivirus après l'avoir mis à jour, sans succès.

Je vous joint le rapport de hijackthis, en vous remerciant pour votre aide :

Logfile of HijackThis v1.99.1
Scan saved at 15:08: VIRUS ALERT!, on 06/09/2008
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP3 (6.00.2900.5512)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\csrss.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\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Creative\Shared Files\CTAudSvc.exe
C:\Program Files\Avira\AntiVir PersonalEdition Classic\sched.exe
C:\Program Files\Avira\AntiVir PersonalEdition Classic\avguard.exe
C:\Program Files\Fichiers communs\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
C:\Program Files\Bonjour\mDNSResponder.exe
C:\WINDOWS\system32\CTsvcCDA.exe
C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\PnkBstrA.exe
C:\WINDOWS\System32\PSIService.exe
C:\Program Files\Spyware Doctor\pctsAuxs.exe
C:\Program Files\Spyware Doctor\pctsSvc.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\System32\alg.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\ASUS\Ai Suite\AiNap\AiNap.exe
C:\Program Files\ASUS\Ai Suite\AiGear3\CpuPowerMonitor.exe
C:\Program Files\ASUS\Ai Suite\EnergySaving\PwSave.exe
C:\Program Files\Analog Devices\Core\smax4pnp.exe
C:\Program Files\Analog Devices\SoundMAX\Smax4.exe
C:\Program Files\Spyware Doctor\pctsTray.exe
C:\Program Files\Avira\AntiVir PersonalEdition Classic\avgnt.exe
C:\Program Files\Logitech\GamePanel Software\LCD Manager\LCDMon.exe
C:\Program Files\Logitech\GamePanel Software\G-series Software\LGDCore.exe
C:\Program Files\Creative\Sound Blaster X-Fi\DVDAudio\CTDVDDET.EXE
C:\Program Files\Creative\Shared Files\Module Loader\DLLML.exe
C:\Program Files\Logitech\GamePanel Software\LCD Manager\Applets\LCDClock.exe
C:\WINDOWS\CTHELPER.EXE
C:\Program Files\Logitech\GamePanel Software\LCD Manager\Applets\LCDCountdown.exe
C:\WINDOWS\system32\CTXFIHLP.EXE
C:\Program Files\Logitech\GamePanel Software\LCD Manager\Applets\LCDPop3.exe
C:\Program Files\ASUS\AASP\1.00.59\aaCenter.exe
C:\Program Files\Logitech\GamePanel Software\LCD Manager\Applets\LCDMedia.exe
C:\Program Files\Creative\Sound Blaster X-Fi\Volume Panel\VolPanlu.exe
C:\WINDOWS\SYSTEM32\CTXFISPI.EXE
C:\WINDOWS\system32\RUNDLL32.EXE
C:\Program Files\Java\jre1.6.0_07\bin\jusched.exe
C:\Program Files\CyberLink\PowerDVD8\PDVD8Serv.exe
C:\Program Files\Cyberlink\Shared Files\brs.exe
C:\Program Files\HP\HP Software Update\HPWuSchd2.exe
C:\Program Files\Google\Google Desktop Search\GoogleDesktop.exe
C:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe
C:\Program Files\Google\Google Desktop Search\GoogleDesktop.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\Winamp\winampa.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
C:\Program Files\DAEMON Tools Pro\DTProAgent.exe
C:\Program Files\ASUS\WiFi-AP @n\WiFi-AP@n.exe
C:\Program Files\HP\Digital Imaging\bin\hpqtra08.exe
C:\Program Files\WinZip\WZQKPICK.EXE
C:\Program Files\Google\Google Desktop Search\GoogleDesktop.exe
C:\Program Files\OpenOffice.org 2.4\program\soffice.exe
C:\Program Files\OpenOffice.org 2.4\program\soffice.BIN
C:\Program Files\Creative\Sound Blaster X-Fi\Entertainment Center\EAXLoadr.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\Program Files\HP\Digital Imaging\bin\hpqSTE08.exe
C:\Program Files\Avira\AntiVir PersonalEdition Classic\avscan.exe
C:\PROGRA~1\Mozilla Firefox\firefox.exe
H:\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://softwarereferral.com/jump.php?wmid=6010&mid=MjI6Ojg5&lid=2
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
R3 - URLSearchHook: free-downloads.net Toolbar - {ecdee021-0d17-467f-a1ff-c7a115230949} - C:\Program Files\free-downloads.net\tbfree.dll
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: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
O2 - BHO: QXK Olive - {870112C8-DC11-45CC-865A-CD930FD9F879} - C:\WINDOWS\vanwxemgfwn.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar1.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\2.1.1119.1736\swg.dll
O2 - BHO: free-downloads.net Toolbar - {ecdee021-0d17-467f-a1ff-c7a115230949} - C:\Program Files\free-downloads.net\tbfree.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar1.dll
O3 - Toolbar: free-downloads.net Toolbar - {ecdee021-0d17-467f-a1ff-c7a115230949} - C:\Program Files\free-downloads.net\tbfree.dll
O3 - Toolbar: gksraemq - {7C74C1B1-81FB-4105-B304-80A12EC6E73D} - C:\WINDOWS\gksraemq.dll
O4 - HKLM\..\Run: [Ai Nap] "C:\Program Files\ASUS\Ai Suite\AiNap\AiNap.exe"
O4 - HKLM\..\Run: [CPU Power Monitor] "C:\Program Files\ASUS\Ai Suite\AiGear3\CpuPowerMonitor.exe"
O4 - HKLM\..\Run: [Cpu Level Up help] C:\Program Files\ASUS\Ai Suite\CpuLevelUpHelp.exe
O4 - HKLM\..\Run: [ASUS Energy Saving] "C:\Program Files\ASUS\Ai Suite\EnergySaving\PwSave.exe"
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Program Files\Analog Devices\Core\smax4pnp.exe
O4 - HKLM\..\Run: [SoundMAX] "C:\Program Files\Analog Devices\SoundMAX\Smax4.exe" /tray
O4 - HKLM\..\Run: [ISTray] "C:\Program Files\Spyware Doctor\pctsTray.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [avgnt] "C:\Program Files\Avira\AntiVir PersonalEdition Classic\avgnt.exe" /min
O4 - HKLM\..\Run: [Launch LCDMon] "C:\Program Files\Logitech\GamePanel Software\LCD Manager\LCDMon.exe"
O4 - HKLM\..\Run: [Launch LGDCore] "C:\Program Files\Logitech\GamePanel Software\G-series Software\LGDCore.exe" /SHOWHIDE
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [CTDVDDET] "C:\Program Files\Creative\Sound Blaster X-Fi\DVDAudio\CTDVDDET.EXE"
O4 - HKLM\..\Run: [RCSystem] "C:\Program Files\Creative\Shared Files\Module Loader\DLLML.exe" RCSystem * -Startup
O4 - HKLM\..\Run: [AudioDrvEmulator] "C:\Program Files\Creative\Shared Files\Module Loader\DLLML.exe" -1 AudioDrvEmulator "C:\Program Files\Creative\Shared Files\Module Loader\Audio Emulator\AudDrvEm.dll"
O4 - HKLM\..\Run: [CTHelper] CTHELPER.EXE
O4 - HKLM\..\Run: [CTxfiHlp] CTXFIHLP.EXE
O4 - HKLM\..\Run: [UpdReg] C:\WINDOWS\UpdReg.EXE
O4 - HKLM\..\Run: [VolPanel] "C:\Program Files\Creative\Sound Blaster X-Fi\Volume Panel\VolPanlu.exe" /r
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_07\bin\jusched.exe"
O4 - HKLM\..\Run: [RemoteControl8] "C:\Program Files\CyberLink\PowerDVD8\PDVD8Serv.exe"
O4 - HKLM\..\Run: [PDVD8LanguageShortcut] "C:\Program Files\CyberLink\PowerDVD8\Language\Language.exe"
O4 - HKLM\..\Run: [BDRegion] C:\Program Files\Cyberlink\Shared Files\brs.exe
O4 - HKLM\..\Run: [HP Software Update] C:\Program Files\HP\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [Google Desktop Search] "C:\Program Files\Google\Google Desktop Search\GoogleDesktop.exe" /startup
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [AppleSyncNotifier] C:\Program Files\Fichiers communs\Apple\Mobile Device Support\bin\AppleSyncNotifier.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [WinampAgent] "C:\Program Files\Winamp\winampa.exe"
O4 - HKLM\..\Run: [winsock32] C:\WINDOWS\system32:winsock32.exe
O4 - HKLM\..\Run: [MSConfig] C:\WINDOWS\PCHealth\HelpCtr\Binaries\MSConfig.exe /auto
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.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: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Program Files\Fichiers communs\Ahead\lib\NMBgMonitor.exe"
O4 - HKCU\..\Run: [DAEMON Tools Pro Agent] "C:\Program Files\DAEMON Tools Pro\DTProAgent.exe"
O4 - Startup: OpenOffice.org 2.4.lnk = C:\Program Files\OpenOffice.org 2.4\program\quickstart.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Fichiers communs\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: ASUS WiFi-AP @n Utility.lnk = C:\Program Files\ASUS\WiFi-AP @n\WiFi-AP@n.exe
O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Program Files\HP\Digital Imaging\bin\hpqtra08.exe
O4 - Global Startup: WinZip Quick Pick.lnk = C:\Program Files\WinZip\WZQKPICK.EXE
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Restrictions present
O7 - HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System, DisableRegedit=1
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_07\bin\ssv.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
O10 - Unknown file in Winsock LSP: c:\program files\bonjour\mdnsnsp.dll
O16 - DPF: {F6ACF75C-C32C-447B-9BEF-46B766368D29} (Creative Software AutoUpdate Support Package) - http://www.creative.com/softwareupdate/su2/ocx/15105/CTPID.cab
O20 - AppInit_DLLs: C:\PROGRA~1\Google\GOOGLE~4\GOEC62~1.DLL
O20 - Winlogon Notify: dimsntfy - %SystemRoot%\System32\dimsntfy.dll (file missing)
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
O21 - SSODL: xrdwbfgn - {C452118F-0990-4DC7-9A72-1F35962DF9AC} - C:\WINDOWS\xrdwbfgn.dll
O21 - SSODL: dgksvbpn - {A9566133-57FB-4206-837C-1902F4D43FC2} - C:\WINDOWS\dgksvbpn.dll
O23 - Service: Adobe LM Service - Unknown owner - C:\Program Files\Fichiers communs\Adobe Systems Shared\Service\Adobelmsvc.exe
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: Apple Mobile Device - Apple Inc. - C:\Program Files\Fichiers communs\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: Service Bonjour (Bonjour Service) - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: Creative Audio Engine Licensing Service - Creative Labs - C:\Program Files\Fichiers communs\Creative Labs Shared\Service\CTAELicensing.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTsvcCDA.exe
O23 - Service: Creative Audio Service (CTAudSvcService) - Creative Technology Ltd - C:\Program Files\Creative\Shared Files\CTAudSvc.exe
O23 - Service: Google Desktop Manager 5.7.806.10245 (GoogleDesktopManager-061008-081103) - Google - C:\Program Files\Google\Google Desktop Search\GoogleDesktop.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: Service de l'iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: PnkBstrA - Unknown owner - C:\WINDOWS\system32\PnkBstrA.exe
O23 - Service: ProtexisLicensing - Unknown owner - C:\WINDOWS\System32\PSIService.exe
O23 - Service: PC Tools Auxiliary Service (sdAuxService) - PC Tools - C:\Program Files\Spyware Doctor\pctsAuxs.exe
O23 - Service: PC Tools Security Service (sdCoreService) - PC Tools - C:\Program Files\Spyware Doctor\pctsSvc.exe

Merci pour votre aide

Cordialement