Merci pour tout !!!
Tout à l'air de bien refonctionner... sauf que j'ai eu quelques petits problèmes au démarrage... il ne reconnaissait plus le clavier (j'ai un laptop !). Mais ça a fini par rentrer dans l'ordre.

Le rapport combofix :
Aurelien - 06-09-28 19:56:11,87 Service Pack 2
ComboFix 06.09.28 - Running from: "C:\Documents and Settings\Aurelien\Bureau"
Command switches used :: /v geedb
(((((((((((((((((((((((((((((((((((((((((((( Other Deletions )))))))))))))))))))))))))))))))))))))))))))))))))
C:\WINDOWS\system32\components
C:\Program Files\Fichiers communs\{20202020-031D-1036-1223-040826040001}
((((((((((((((((((((((((((((((( Files Created from 2006-08-28 to 2006-09-28 ))))))))))))))))))))))))))))))))))
2006-09-28 19:50 90,112 --a------ C:\WINDOWS\system32\AVASTSS.scr
2006-09-28 19:50 87,424 --a------ C:\WINDOWS\system32\drivers\aswmon2.sys
2006-09-28 19:50 85,952 --a------ C:\WINDOWS\system32\drivers\aswmon.sys
2006-09-28 19:50 666,240 --a------ C:\WINDOWS\system32\aswBoot.exe
2006-09-28 19:50 36,176 --a------ C:\WINDOWS\system32\drivers\aswTdi.sys
2006-09-28 19:50 24,560 --a------ C:\WINDOWS\system32\drivers\aavmker4.sys
2006-09-28 19:50 16,352 --a------ C:\WINDOWS\system32\drivers\aswRdr.sys
2006-09-22 16:31 53,248 --a------ C:\WINDOWS\system32\Process.exe
2006-09-22 16:31 40,960 --a------ C:\WINDOWS\system32\swsc.exe
2006-09-22 16:31 288,417 --a------ C:\WINDOWS\system32\SrchSTS.exe
2006-09-22 16:31 135,168 --a------ C:\WINDOWS\system32\swreg.exe
2006-09-22 16:23 1,492 --a------ C:\WINDOWSvundofix.reg
2006-09-14 18:37 128,744 --a------ C:\WINDOWS\system32\mucltui.dll
(((((((((((((((((((((((((((((((((((((((((((((((( Find3M Report )))))))))))))))))))))))))))))))))))))))))))))))))))))
2006-09-28 19:57 -------- d-------- C:\Program Files\Fichiers communs
2006-09-28 19:50 -------- d-------- C:\Program Files\Alwil Software
2006-09-28 19:24 -------- d-------- C:\Program Files\Mozilla Firefox
2006-09-26 22:16 -------- d-------- C:\Program Files\FairUse Wizard 2
2006-09-26 17:50 -------- d-------- C:\Program Files\ewido anti-spyware 4.0
2006-09-25 01:39 -------- d-------- C:\Program Files\Sunbelt Software
2006-09-23 16:05 -------- d-------- C:\Program Files\InterActual
2006-09-22 17:11 -------- d-------- C:\Program Files\Jamloader
2006-09-22 16:09 -------- d---s---- C:\Documents and Settings\Aurelien\Application Data\Microsoft
2006-09-22 16:09 -------- d-------- C:\Program Files\Fichiers communs\Caere
2006-09-22 16:04 -------- d--h----- C:\Program Files\InstallShield Installation Information
2006-09-22 16:04 -------- d-------- C:\Program Files\Macromedia
2006-09-22 16:04 -------- d-------- C:\Program Files\Fichiers communs\Macromedia
2006-09-22 15:59 -------- d-------- C:\Program Files\gestion du site la sauce a sons
2006-09-21 02:00 -------- d-------- C:\Program Files\a-squared Anti-Malware
2006-09-19 23:48 -------- d-------- C:\Program Files\CCleaner
2006-09-18 00:54 -------- d-------- C:\Program Files\a-squared Free
2006-09-16 13:42 -------- d-------- C:\Program Files\Fichiers communs\Microsoft Shared
2006-09-13 18:06 -------- d-------- C:\Program Files\eoRezo
2006-09-13 18:06 -------- d-------- C:\Documents and Settings\Aurelien\Application Data\EoRezo
2006-09-13 01:31 -------- d-------- C:\Program Files\WinAVI Video Converter
2006-09-11 18:46 -------- d-------- C:\Program Files\Microsoft GIF Animator
2006-09-10 20:59 -------- d-------- C:\Documents and Settings\Aurelien\Application Data\MX
2006-09-10 15:40 -------- d-------- C:\Program Files\TuneUp Utilities 2006
2006-09-06 00:38 -------- d-------- C:\Program Files\MSN Messenger
2006-08-21 14:26 16896 --a------ C:\WINDOWS\system32\fltlib.dll
2006-08-21 11:14 23040 --a------ C:\WINDOWS\system32\fltmc.exe
2006-08-21 11:14 128896 --a------ C:\WINDOWS\system32\drivers\fltmgr.sys
2006-08-13 23:16 -------- d-------- C:\Program Files\Internet Explorer
2006-08-12 14:16 -------- d-------- C:\Program Files\ClamWin
2006-07-29 19:32 48936 --a------ C:\WINDOWS\system32\sirenacm.dll
2006-07-27 15:26 679424 --a------ C:\WINDOWS\system32\inetcomm.dll
2006-07-21 10:27 72704 --a------ C:\WINDOWS\system32\hlink.dll
(((((((((((((((((((((((((((((((((((((((((( Reg Loading Points ))))))))))))))))))))))))))))))))))))))))))))))))
*Note* empty entries are not shown
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"ClamWin"="\"C:\\Program Files\\ClamWin\\bin\\ClamTray.exe\" --logon"
"PHIME2002ASync"="C:\\WINDOWS\\system32\\IME\\TINTLGNT\\TINTSETP.EXE /SYNC"
"PHIME2002A"="C:\\WINDOWS\\system32\\IME\\TINTLGNT\\TINTSETP.EXE /IMEName"
"!ewido"="\"C:\\Program Files\\ewido anti-spyware 4.0\\ewido.exe\" /minimized"
"avast!"="C:\\PROGRA~1\\ALWILS~1\\Avast4\\ashDisp.exe"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OptionalComponents]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OptionalComponents\IMAIL]
"Installed"="1"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OptionalComponents\MAPI]
"Installed"="1"
"NoChange"="1"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OptionalComponents\MSFS]
"Installed"="1"
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Desktop\Components]
"DeskHtmlVersion"=dword:00000110
"DeskHtmlMinorVersion"=dword:00000005
"Settings"=dword:00000001
"GeneralFlags"=dword:00000004
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\shellexecutehooks]
"{AEB6717E-7E19-11d0-97EE-00C04FD91972}"=""
"{57B86673-276A-48B2-BAE7-C6DBB3020EB8}"="ewido anti-spyware 4.0"
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\explorer]
"NoDriveTypeAutoRun"=dword:00000000
"GreyMSIAds"=dword:00000001
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\explorer\Run]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system]
"dontdisplaylastusername"=dword:00000000
"legalnoticecaption"=""
"legalnoticetext"=""
"shutdownwithoutlogon"=dword:00000001
"undockwithoutlogon"=dword:00000001
"verbosestatus"=dword:00000001
[HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\explorer]
"NoDriveTypeAutoRun"=dword:00000091
[HKEY_USERS\S-1-5-18\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\explorer]
"NoDriveTypeAutoRun"=dword:00000091
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad]
"PostBootReminder"="{7849596a-48ea-486e-8937-a2a3009f31a9}"
"CDBurn"="{fbeb8a05-beee-4442-804e-409d6c4515e9}"
"WebCheck"="{E6FB5E20-DE35-11CF-9C87-00AA005127ED}"
"SysTray"="{35CEC8A3-2BE6-11D2-8773-92E220524153}"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run-]
"IMJPMIG8.1"="\"C:\\WINDOWS\\IME\\imjp8_1\\IMJPMIG.EXE\" /Spoil /RemAdvDef /Migration32"
"Cpqset"="C:\\Program Files\\HPQ\\Default Settings\\cpqset.exe"
"eabconfg.cpl"="C:\\Program Files\\HPQ\\Quick Launch Buttons\\EabServr.exe /Start"
"QuickTime Task"="\"C:\\Program Files\\QuickTime\\qttask.exe\" -atboottime"
"PHIME2002ASync"="C:\\WINDOWS\\system32\\IME\\TINTLGNT\\TINTSETP.EXE /SYNC"
"HPHUPD05"="c:\\Program Files\\Hewlett-Packard\\{45B6180B-DCAB-4093-8EE8-6164457517F0}\\hphupd05.exe"
"HP Software Update"="C:\\Program Files\\Hewlett-Packard\\HP Software Update\\HPWuSchd2.exe"
"smapp"="C:\\Program Files\\Analog Devices\\SoundMAX\\SMTray.exe"
"UpdateManager"="\"C:\\Program Files\\Fichiers communs\\Sonic\\Update Manager\\sgtray.exe\" /r"
"DiskeeperSystray"="\"C:\\Program Files\\Executive Software\\Diskeeper\\DkIcon.exe\""
"SunJavaUpdateSched"="C:\\Program Files\\Java\\j2re1.4.2_03\\bin\\jusched.exe"
"NvCplDaemon"="RUNDLL32.EXE C:\\WINDOWS\\system32\\NvCpl.dll,NvStartup"
"HPHmon05"="C:\\WINDOWS\\system32\\hphmon05.exe"
"NeroFilterCheck"="C:\\WINDOWS\\system32\\NeroCheck.exe"
"ClamWin"="\"C:\\Program Files\\ClamWin\\bin\\ClamTray.exe\" --logon"
"nwiz"="nwiz.exe /install"
"a-squared"="\"C:\\Program Files\\a-squared Anti-Malware\\a2guard.exe\""
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\MSCONFIG\Startupreg]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\MSCONFIG\Startupreg\AGRSMMSG]
"key"="SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run"
"item"="AGRSMMSG"
"hkey"="HKLM"
"command"="AGRSMMSG.exe"
"inimapping"="0"
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\MSCONFIG\Startupreg\Apoint]
"key"="SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run"
"item"="Apoint"
"hkey"="HKLM"
"command"="C:\\Program Files\\Apoint2K\\Apoint.exe"
"inimapping"="0"
HKEY_LOCAL_MACHINE\system\currentcontrolset\control\securityproviders
securityproviders REG_SZ msapsspc.dll, schannel.dll, digest.dll, msnsspc.dll
Contents of the 'Scheduled Tasks' folder
C:\WINDOWS\tasks\1-Click Maintenance.job
C:\WINDOWS\tasks\Maintenance en 1 clic.job
Completion time: 28/09/2006 19:58:38.03
ComboFix.txt

Le rapport Hijackthis :
Logfile of HijackThis v1.99.1
Scan saved at 20:04, on 28/09/2006
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:\Program Files\Executive Software\Diskeeper\DkService.exe
C:\Program Files\ewido anti-spyware 4.0\guard.exe
C:\Program Files\Sunbelt Software\Personal Firewall\kpf4ss.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\Program Files\Analog Devices\SoundMAX\SMAgent.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Sunbelt Software\Personal Firewall\kpf4gui.exe
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\ClamWin\bin\ClamTray.exe
C:\Program Files\Sunbelt Software\Personal Firewall\kpf4gui.exe
C:\Program Files\Windows Media Player\wmplayer.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Documents and Settings\Aurelien\Mes documents\DOWNLOAD\test.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O4 - HKLM\..\Run: [ClamWin] "C:\Program Files\ClamWin\bin\ClamTray.exe" --logon
O4 - HKLM\..\Run: [PHIME2002ASync] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /SYNC
O4 - HKLM\..\Run: [PHIME2002A] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /IMEName
O4 - HKLM\..\Run: [!ewido] "C:\Program Files\ewido anti-spyware 4.0\ewido.exe" /minimized
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel -
res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\j2re1.4.2_03\bin\npjpi142_03.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\j2re1.4.2_03\bin\npjpi142_03.dll
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.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
O15 - Trusted Zone:
http://www.nomas.fr
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) -
http://update.microsoft.com/microsoftupdate/v6/V5Controls/en/x86/client/muweb_site.cab?1158098444875
O17 - HKLM\System\CCS\Services\Tcpip\..\{8EBED515-72CA-49EA-907C-B590A850703B}: NameServer = 212.151.136.242 212.151.137.170
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
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: Diskeeper - Executive Software International, Inc. - C:\Program Files\Executive Software\Diskeeper\DkService.exe
O23 - Service: ewido anti-spyware 4.0 guard - Anti-Malware Development a.s. - C:\Program Files\ewido anti-spyware 4.0\guard.exe
O23 - Service: HP WMI Interface (hpqwmi) - Hewlett-Packard Development Company, L.P. - C:\Program Files\HPQ\SHARED\HPQWMI.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Sunbelt Kerio Personal Firewall 4 (KPF4) - Sunbelt Software - C:\Program Files\Sunbelt Software\Personal Firewall\kpf4ss.exe
O23 - Service: Macromedia Licensing Service - Unknown owner - C:\Program Files\Fichiers communs\Macromedia Shared\Service\Macromedia Licensing.exe
O23 - Service: MD Simple Burner Service (NetMDSB) - Sony Corporation - C:\Program Files\Sony\MD Simple Burner\NetMDSB.exe
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: PACSPTISVR - Sony Corporation - C:\Program Files\Fichiers communs\Sony Shared\AVLib\Pacsptisvr.exe
O23 - Service: ServiceLayer - Nokia. - C:\Program Files\Fichiers communs\PCSuite\Services\ServiceLayer.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Program Files\Analog Devices\SoundMAX\SMAgent.exe
O23 - Service: Sony SPTI Service (SPTISRV) - Sony Corporation - C:\Program Files\Fichiers communs\Sony Shared\AVLib\Sptisrv.exe
O23 - Service: TuneUp WinStyler Theme Service (TUWinStylerThemeSvc) - TuneUp Software GmbH - C:\Program Files\TuneUp Utilities 2006\WinStylerThemeSvc.exe
Au fait, j'ai bien un antivirus (Clamwin) et j'utilise le pare-feu Windows.
Peut-être pas suffisant... ?