Ordinateur très lent

Bonjour,
mon PC est très lent pendant les 10 premières minutes (utilisation de l'UC à 100%, programmes qui ne répondent pas quand je les lance).

Ce problème existe aussi lorsque mon logiciel de messagerie Eudora se connecte à internet pour collecter mes messages (l'UC est utilisée à 100%, les autres programmes qui accèdent à internet bloquent).

Voici le rapport de mon Hijackthis, si nécessaire.

Une personne pourrait-elle m'aider?
Je vous remercie par avance.

Logfile of HijackThis v1.99.1
Scan saved at 07:33:24, on 19/05/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16414)

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:\WINDOWS\Explorer.EXE
C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe
C:\Program Files\Java\jre1.6.0_01\bin\jusched.exe
C:\WINDOWS\VM_STI.EXE
C:\Program Files\Acronis\TrueImage\TrueImageMonitor.exe
C:\Program Files\Fichiers communs\Acronis\Schedule2\schedhlp.exe
C:\Program Files\Fichiers communs\Acronis\Schedule2\schedul2.exe
C:\Program Files\NavNT\defwatch.exe
C:\Program Files\Executive Software\DiskeeperWorkstation\DKService.exe
C:\Program Files\NavNT\rtvscan.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\Program Files\NavNT\vptray.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Adobe\Acrobat 5.0\Distillr\AcroTray.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\ZoneLabs\vsmon.exe
C:\WINDOWS\system32\MsPMSPSv.exe
C:\WINDOWS\system32\MsgSys.EXE
C:\WINDOWS\system32\taskmgr.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\WINDOWS\system32\devldr32.exe
C:\Program Files\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.ca/?gws_rd=ssl
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = https://www.msn.com/fr-fr/?ocid=iehp
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.msn.com/fr-fr/?ocid=iehp
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Acrobat\ActiveX\AcroIEHelper.ocx
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_01\bin\ssv.dll
O4 - HKLM\..\Run: [Zone Labs Client] "C:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_01\bin\jusched.exe"
O4 - HKLM\..\Run: [SSBkgdUpdate] C:\Program Files\Fichiers communs\Scansoft Shared\SSBkgdUpdate\SSBkgdupdate.exe -Embedding -boot
O4 - HKLM\..\Run: [BigDogPath] C:\WINDOWS\VM_STI.EXE VIMICRO USB PC Camera
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE NvQTwk,NvCplDaemon initialize
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [TrueImageMonitor.exe] C:\Program Files\Acronis\TrueImage\TrueImageMonitor.exe
O4 - HKLM\..\Run: [Acronis Scheduler2 Service] "C:\Program Files\Fichiers communs\Acronis\Schedule2\schedhlp.exe"
O4 - HKLM\..\Run: [UpdReg] C:\WINDOWS\Updreg.exe
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKLM\..\Run: [vptray] C:\Program Files\NavNT\vptray.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - Global Startup: Acrobat Assistant.lnk = C:\Program Files\Adobe\Acrobat 5.0\Distillr\AcroTray.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Fichiers communs\Adobe\Calibration\Adobe Gamma Loader.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_01\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_01\bin\ssv.dll
O11 - Options group: [INTERNATIONAL] International*
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O16 - DPF: {0A5FD7C5-A45C-49FC-ADB5-9952547D5715} (Creative Software AutoUpdate) - http://www.creative.com/su/ocx/15026/CTSUEng.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/...
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O16 - DPF: {F5D98C43-DB16-11CF-8ECA-0000C0FD59C7} (ActiveCGM Control) - http://infolot.mrnf.gouv.qc.ca/ACGM/acgm.cab
O16 - DPF: {F6ACF75C-C32C-447B-9BEF-46B766368D29} (Creative Software AutoUpdate Support Package) - http://www.creative.com/su/ocx/15026/CTPID.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: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FICHIE~1\Skype\SKYPE4~1.DLL
O20 - Winlogon Notify: NavLogon - C:\WINDOWS\system32\NavLogon.dll
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
O23 - Service: Acronis Scheduler2 Service (AcrSch2Svc) - Acronis - C:\Program Files\Fichiers communs\Acronis\Schedule2\schedul2.exe
O23 - Service: BvrpKrnl - Unknown owner - C:\Program Files\WinFax eXPert\BVRPKrnl.exe
O23 - Service: DefWatch - Symantec Corporation - C:\Program Files\NavNT\defwatch.exe
O23 - Service: Diskeeper - Executive Software International, Inc. - C:\Program Files\Executive Software\DiskeeperWorkstation\DKService.exe
O23 - Service: Norton AntiVirus Client (Norton AntiVirus Server) - Symantec Corporation - C:\Program Files\NavNT\rtvscan.exe
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - C:\WINDOWS\system32\ZoneLabs\vsmon.exe