PC infecte par Trojan(st3.dll)

Bonjour a tous. voila mon pb est que spyaxe s'installe tout seul et meme si je le supprime il revient a chaque demarrage du pc! j'ai essayé presque tous les logiciels du type spybot et rien ne peut le supprimer! mon antivirus non plus! Que faire?
Voici mon log hijackthis:

Logfile of HijackThis v1.99.1
Scan saved at 12:07:20, on 25/11/2005
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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Fichiers communs\Symantec Shared\ccSetMgr.exe
C:\Program Files\Fichiers communs\Symantec Shared\SNDSrvc.exe
C:\Program Files\Fichiers communs\Symantec Shared\SPBBC\SPBBCSvc.exe
C:\Program Files\Fichiers communs\Symantec Shared\ccEvtMgr.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Executive Software\Diskeeper\DkService.exe
C:\Program Files\Fichiers communs\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\Utilitaires\Norton AntiVirus\navapsvc.exe
C:\Utilitaires\Norton AntiVirus\IWP\NPFMntor.exe
C:\WINDOWS\system32\HPZipm12.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Fichiers communs\Symantec Shared\CCPD-LC\symlcsvc.exe
C:\WINDOWS\system32\mssearchnet.exe
C:\WINDOWS\system32\nvctrl.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\Program Files\HP\HP Software Update\HPWuSchd2.exe
C:\Program Files\SurfAccuracy\SAcc.exe
C:\Program Files\Fichiers communs\Symantec Shared\ccApp.exe
C:\Program Files\MSN Messenger\MsnMsgr.Exe
C:\Program Files\Windows Media Player\wmplayer.exe
C:\Utilitaires\Crazy Browser\Crazy Browser.exe
C:\hijackthis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://www.google.fr
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://home.neuf.fr/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://home.neuf.fr
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://home.neuf.fr/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
R3 - Default URLSearchHook is missing
O2 - BHO: HomepageBHO - {7caf96a2-c556-460a-988e-76fc7895d284} - C:\WINDOWS\system32\hpCCD5.tmp
O4 - HKLM\..\Run: [DiskeeperSystray] "C:\Program Files\Executive Software\Diskeeper\DkIcon.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [ATIPTA] "C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe"
O4 - HKLM\..\Run: [ATICCC] "C:\Program Files\ATI Technologies\ATI.ACE\cli.exe" runtime
O4 - HKLM\..\Run: [HP Software Update] "C:\Program Files\HP\HP Software Update\HPWuSchd2.exe"
O4 - HKLM\..\Run: [SurfAccuracy] C:\Program Files\SurfAccuracy\SAcc.exe
O4 - HKLM\..\Run: [Sp2Protect] C:\WINDOWS\system32\sp2protect.exe
O4 - HKLM\..\Run: [Bluetooth] C:\WINDOWS\system32\shell32.exe
O4 - HKLM\..\Run: [I download pirated Software] C:\WINDOWS\system32\_.gof
O4 - HKLM\..\Run: [Registry Backup] C:\WINDOWS\system32\wuauclt10.exe
O4 - HKLM\..\Run: [lydod] C:\WINDOWS\lydod.exe
O4 - HKLM\..\Run: [uhwdwz] C:\WINDOWS\uhwdwz.exe
O4 - HKLM\..\Run: [jczav] C:\WINDOWS\jczav.exe
O4 - HKLM\..\Run: [mzedop] C:\WINDOWS\mzedop.exe
O4 - HKLM\..\Run: [ccApp] "C:\Program Files\Fichiers communs\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [Symantec NetDriver Monitor] C:\PROGRA~1\SYMNET~1\SNDMon.exe /Consumer
O4 - HKLM\..\Run: [System service79] C:\WINDOWS\\\etb\\pokapoka79.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O14 - IERESET.INF: START_PAGE_URL=http://www.clubic.com
O16 - DPF: {00B71CFB-6864-4346-A978-C0A14556272C} (Checkers Class) - http://messenger.zone.msn.com/binary/msgrchkr.cab31267....
O16 - DPF: {14B87622-7E19-4EA8-93B3-97215F77A6BC} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsPACl...
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsClie...
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/MsnMessengerSetupDown...
O16 - DPF: {B8BE5E93-A60C-4D26-A2DC-220313175592} (ZoneIntro Class) - http://messenger.zone.msn.com/binary/ZIntro.cab32846.ca...
O16 - DPF: {E6187999-9FEC-46A1-A20F-F4CA977D5643} (ZoneChess Object) - http://messenger.zone.msn.com/binary/Chess.cab31267.cab
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
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: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - C:\Program Files\Fichiers communs\Symantec Shared\ccEvtMgr.exe
O23 - Service: Symantec Password Validation (ccPwdSvc) - Symantec Corporation - C:\Program Files\Fichiers communs\Symantec Shared\ccPwdSvc.exe
O23 - Service: Symantec Settings Manager (ccSetMgr) - Symantec Corporation - C:\Program Files\Fichiers communs\Symantec Shared\ccSetMgr.exe
O23 - Service: Diskeeper - Executive Software International, Inc. - C:\Program Files\Executive Software\Diskeeper\DkService.exe
O23 - Service: Service Norton AntiVirus Auto-Protect (navapsvc) - Symantec Corporation - C:\Utilitaires\Norton AntiVirus\navapsvc.exe
O23 - Service: Norton AntiVirus Firewall Monitor Service (NPFMntor) - Symantec Corporation - C:\Utilitaires\Norton AntiVirus\IWP\NPFMntor.exe
O23 - Service: Trend Micro Personal Firewall (PccPfw) - Unknown owner - C:\Program Files\Trend Micro\Internet Security\PccPfw.exe (file missing)
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe
O23 - Service: SAVScan - Symantec Corporation - C:\Utilitaires\Norton AntiVirus\SAVScan.exe
O23 - Service: ScriptBlocking Service (SBService) - Symantec Corporation - C:\PROGRA~1\FICHIE~1\SYMANT~1\SCRIPT~1\SBServ.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - C:\Program Files\Fichiers communs\Symantec Shared\SNDSrvc.exe
O23 - Service: Symantec SPBBCSvc (SPBBCSvc) - Symantec Corporation - C:\Program Files\Fichiers communs\Symantec Shared\SPBBC\SPBBCSvc.exe
O23 - Service: Symantec Core LC - Symantec Corporation - C:\Program Files\Fichiers communs\Symantec Shared\CCPD-LC\symlcsvc.exe
O23 - Service: Trend NT Realtime Service (Tmntsrv) - Unknown owner - C:\Program Files\Trend Micro\Internet Security\Tmntsrv.exe (file missing)
O23 - Service: Trend Micro Proxy Service (tmproxy) - Unknown owner - C:\Program Files\Trend Micro\Internet Security\tmproxy.exe (file missing)

Pourriez vous m'aider svp en sachant que je suis moyen en informatique! merci d'avance