Bureau qui disparait/Trojan suspecté

Bonjour,
Depuis quelques jours, je me bats contre mon bureau Windows qui ne cesse de s'effacer. De plus, des messages d'erreurs apparaissent avec comme message :" Erreur, l'image D:/Docs~1/Seb/Locals/TMP1.tmp n'est pas une image windows valide".
Je poste mon rapport HijackThis ici.
Merci de l'aide (j'suis desepéré), Joyeux Noël
EagleOne

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 18:21:06, on 24/12/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
Boot mode: Normal

Running processes:
D:\WINDOWS\System32\smss.exe
D:\WINDOWS\system32\winlogon.exe
D:\WINDOWS\system32\services.exe
D:\WINDOWS\system32\lsass.exe
D:\WINDOWS\system32\svchost.exe
D:\WINDOWS\System32\svchost.exe
D:\Program Files\Fichiers communs\Symantec Shared\ccSetMgr.exe
D:\Program Files\Fichiers communs\Symantec Shared\SNDSrvc.exe
D:\Program Files\Fichiers communs\Symantec Shared\SPBBC\SPBBCSvc.exe
D:\Program Files\Fichiers communs\Symantec Shared\ccEvtMgr.exe
D:\WINDOWS\system32\spoolsv.exe
D:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
D:\Program Files\Diskeeper Corporation\Diskeeper\DkService.exe
D:\Program Files\LogMeIn\x86\RaMaint.exe
D:\Program Files\LogMeIn\x86\LogMeIn.exe
D:\Program Files\Norton AntiVirus\navapsvc.exe
D:\Program Files\Norton AntiVirus\IWP\NPFMntor.exe
D:\WINDOWS\System32\svchost.exe
D:\WINDOWS\system32\nvsvc32.exe
D:\Program Files\Symantec\LiveUpdate\ALUSchedulerSvc.exe
D:\WINDOWS\system32\svchost.exe
D:\Program Files\Fichiers communs\Symantec Shared\CCPD-LC\symlcsvc.exe
D:\WINDOWS\system32\wscntfy.exe
D:\WINDOWS\system32\WgaTray.exe
D:\Program Files\Mozilla Firefox\firefox.exe
D:\Program Files\WinRAR\WinRAR.exe
D:\DOCUME~1\SBASTI~1\LOCALS~1\Temp\Rar$EX01.093\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://www.google.fr/toolbar/ie8/sidebar.html
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.google.fr/?gws_rd=ssl
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.fr/?gws_rd=ssl
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://www.google.fr/toolbar/ie8/sidebar.html
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://www.google.fr/keyword/%s
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
F3 - REG:win.ini: load=D:\WINDOWS\system32\awvvt.exe
O3 - Toolbar: Yahoo! Companion - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - D:\Program Files\Yahoo!\Companion\Installs\cpn\ycomp5_3_12_0.dll
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - D:\Program Files\Norton AntiVirus\NavShExt.dll
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE D:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE D:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [Anti Trojan Elite] D:\Program Files\Anti Trojan Elite\TJEnder.exe :NO
O4 - HKLM\..\Run: [spywarefighterguard] D:\Program Files\SPYWAREfighter\spftray.exe
O4 - HKLM\..\Run: [!AVG Anti-Spyware] "D:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe" /minimized
O4 - HKCU\..\Run: [DAEMON Tools] "D:\Program Files\DAEMON Tools\daemon.exe" -lang 1033
O4 - HKCU\..\Run: [msnmsgr] "D:\Program Files\MSN Messenger\msnmsgr.exe" /background
O4 - HKUS\S-1-5-19\..\RunOnce: [Config] %systemroot%\system32\run.cmd (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-19\..\RunOnce: [tscuninstall] %systemroot%\system32\tscupgrd.exe (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-19\..\RunOnce: [nltide1] cmd.exe /C move /Y "%SystemRoot%\System32\syssetub.dll" "%SystemRoot%\System32\syssetup.dll" (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-19\..\RunOnce: [nltide2] cmd.exe /C rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,L,,4,N (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\RunOnce: [Config] %systemroot%\system32\run.cmd (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-18\..\RunOnce: [Config] %systemroot%\system32\run.cmd (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\RunOnce: [Config] %systemroot%\system32\run.cmd (User 'Default user')
O4 - Startup: RC.lnk = D:\Program Files\DTV\DTV\RC.exe
O4 - Startup: SpeedFan.lnk = D:\Program Files\SpeedFan\speedfan.exe
O4 - Global Startup: Utilitaire réseau pour SAGEM Wi-Fi 11g USB adapter.lnk = ?
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - D:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - D:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - D:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - D:\PROGRA~1\SPYBOT~1\SDHelper.dll
O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{6078B709-441A-4BCB-AFF7-2C2412203535}: NameServer = 192.168.1.1
O17 - HKLM\System\CCS\Services\Tcpip\..\{9F14EA70-FAB7-4120-8150-F109169190AE}: NameServer = 192.168.2.1,0.0.0.0
O17 - HKLM\System\CCS\Services\Tcpip\..\{FA1C291F-119E-440F-8913-CA8C4599AA78}: NameServer = 192.168.1.1
O23 - Service: AVG Anti-Spyware Guard - GRISOFT s.r.o. - D:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - D:\Program Files\Fichiers communs\Symantec Shared\ccEvtMgr.exe
O23 - Service: Symantec Password Validation (ccPwdSvc) - Symantec Corporation - D:\Program Files\Fichiers communs\Symantec Shared\ccPwdSvc.exe
O23 - Service: Symantec Settings Manager (ccSetMgr) - Symantec Corporation - D:\Program Files\Fichiers communs\Symantec Shared\ccSetMgr.exe
O23 - Service: Diskeeper - Diskeeper Corporation - D:\Program Files\Diskeeper Corporation\Diskeeper\DkService.exe
O23 - Service: LiveUpdate - Symantec Corporation - D:\PROGRA~1\Symantec\LIVEUP~1\LUCOMS~1.EXE
O23 - Service: LogMeIn Maintenance Service (LMIMaint) - LogMeIn, Inc. - D:\Program Files\LogMeIn\x86\RaMaint.exe
O23 - Service: LogMeIn - LogMeIn, Inc. - D:\Program Files\LogMeIn\x86\LogMeIn.exe
O23 - Service: Service Norton AntiVirus Auto-Protect (navapsvc) - Symantec Corporation - D:\Program Files\Norton AntiVirus\navapsvc.exe
O23 - Service: Norton AntiVirus Firewall Monitor Service (NPFMntor) - Symantec Corporation - D:\Program Files\Norton AntiVirus\IWP\NPFMntor.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - D:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Planificateur LiveUpdate automatique - Symantec Corporation - D:\Program Files\Symantec\LiveUpdate\ALUSchedulerSvc.exe
O23 - Service: SAVScan - Symantec Corporation - D:\Program Files\Norton AntiVirus\SAVScan.exe
O23 - Service: ScriptBlocking Service (SBService) - Symantec Corporation - D:\PROGRA~1\FICHIE~1\SYMANT~1\SCRIPT~1\SBServ.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - D:\Program Files\Fichiers communs\Symantec Shared\SNDSrvc.exe
O23 - Service: Symantec SPBBCSvc (SPBBCSvc) - Symantec Corporation - D:\Program Files\Fichiers communs\Symantec Shared\SPBBC\SPBBCSvc.exe
O23 - Service: SPYWAREfighterRP - SpamFighter APS - D:\Program Files\SPYWAREfighter\spfprc.exe
O23 - Service: Symantec Core LC - Symantec Corporation - D:\Program Files\Fichiers communs\Symantec Shared\CCPD-LC\symlcsvc.exe