Aide Pc lent

Bonjour à vous.
Voila je post sur ce forum car j'ai un souci avec mon PC, je le trouve assez lent, avant je n'avais constaté aucun ralentissement et depuis ces derniers temps il est anormalement lent. Dans le gestionnaire de taches windows l'utilisation de "l'UC" est en permanence à 100% même lorsque je ne lance aucunes applications, pourtant dans la liste des processus il y a iexplore.exe qui recquiert en permanence une quantité de mémoire sidérante (pourtant je n'ai pas utilisé internet explorer depuis des mois).
http://img385.imageshack.us/img385/4475/screenlq3.png

sur le screen on voit bien que mon Pc tourne à fond
Je ne sais pas si les ralentissements chroniques de mon PC viennent exclusivement de la mais en tout cas j'imagine que ca peut en faire partie.
Voyez vous une solution à mon problème ?

vu que ca a l'air d'être la procédure la plus courante, ci joint un rapport de hijackthis :

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 12:17:38, on 08/03/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
Boot mode: Normal

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:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Fichiers communs\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
C:\WINDOWS\system32\CTsvcCDA.EXE
C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
C:\Norman\NVC\BIN\Zanda.exe
C:\Program Files\Spyware Doctor\svcntaux.exe
C:\Program Files\Spyware Doctor\swdsvc.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
C:\NORMAN\Nvc\BIN\nvcoas.exe
C:\NORMAN\Nvc\BIN\NVCSCHED.EXE
C:\NORMAN\Nvc\BIN\NJEEVES.EXE
C:\NORMAN\Nvc\BIN\nipsvc.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\SOUNDMAN.EXE
C:\NORMAN\Nvc\BIN\ZLH.EXE
C:\Program Files\HP\HP Software Update\HPWuSchd2.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Program Files\Neuf\Kit\WiFi\9wifi.exe
C:\ATI-CPanel\atiptaxx.exe
C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe
C:\NORMAN\Nvc\BIN\NYMSE.EXE
C:\NORMAN\Nvc\BIN\NIP.EXE
C:\Program Files\Spyware Doctor\SDTrayApp.exe
C:\NORMAN\Nvc\BIN\cclaw.exe
C:\Program Files\QuickTime\QTTask.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
C:\WINDOWS\system32\wscntfy.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\SAGEM\SAGEM F@st 800-840\dslmon.exe
C:\Program Files\HP\Digital Imaging\bin\hpqtra08.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe
C:\WINDOWS\System32\wbem\wmiprvse.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O1 - Hosts: 88.191.30.28 L2authd.lineage2.com
O1 - Hosts: 88.191.30.28 L2testauthd.lineage2.com
O2 - BHO: DownloadRedirect Class - {00000000-6CB0-410C-8C3D-8FA8D2011D0A} - C:\Program Files\iMesh\iMesh5\iMeshBHO.dll (file missing)
O2 - BHO: eBay Toolbar Helper - {22D8E815-4A5E-4DFB-845E-AAB64207F5BD} - C:\Program Files\eBay\eBay Toolbar2\eBayTB.dll (file missing)
O2 - BHO: EoRezoBHO - {64F56FC1-1272-44CD-BA6E-39723696E350} - C:\Program Files\EoRezo\EoAdv\EoRezoBHO.dll (file missing)
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Windows Live Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar2.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\2.1.1119.1736\swg.dll
O3 - Toolbar: eBay Toolbar - {92085AD4-F48A-450D-BD93-B28CC7DF67CE} - C:\Program Files\eBay\eBay Toolbar2\eBayTB.dll (file missing)
O3 - Toolbar: Yahoo! Toolbar avec bloqueur de fenêtres pop-up - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [Norman ZANDA] C:\NORMAN\Nvc\BIN\ZLH.EXE /LOAD /SPLASH
O4 - HKLM\..\Run: [HP Software Update] "C:\Program Files\HP\HP Software Update\HPWuSchd2.exe"
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [Autoconfigurateur WiFi Neuf] "C:\Program Files\Neuf\Kit\WiFi\9wifi.exe"
O4 - HKLM\..\Run: [ATIPTA] C:\ATI-CPanel\atiptaxx.exe
O4 - HKLM\..\Run: [UPCTPcw] C:\Program Files\PCTurboPro_Free\UPCTPcw.exe -c
O4 - HKLM\..\Run: [PCTurboPro] C:\Program Files\PCTurboPro_Free\pctp.exe logon
O4 - HKLM\..\Run: [mmtask] "C:\Program Files\Musicmatch\Musicmatch Jukebox\mmtask.exe"
O4 - HKLM\..\Run: [!AVG Anti-Spyware] "C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe" /minimized
O4 - HKLM\..\Run: [eduuhwhfk] c:\windows\system32\eduuhwhfk.exe eduuhwhfk
O4 - HKLM\..\Run: [NI.UWAS6V_0001_N91M2208] "C:\Documents and Settings\Gilbert CREPEAU\Bureau\WinAntiSpyware2006FreeInstall_fr.exe" -nag
O4 - HKLM\..\Run: [SDTray] "C:\Program Files\Spyware Doctor\SDTrayApp.exe"
O4 - HKLM\..\Run: [copy real junk the] C:\Documents and Settings\All Users\Application Data\Name beep copy real\iso inside.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [ItsTV] "C:\Program Files\Its Label\ItsTV\ItsTV.exe"
O4 - HKLM\..\Run: [EoEngine] "C:\Program Files\EoRezo\EoEngine.exe"
O4 - HKLM\..\Run: [bngezomdux] c:\windows\system32\bngezomdux.exe bngezomdux
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [64 Rule] C:\DOCUME~1\LOCREP~1\APPLIC~1\DUMBRE~1\browseview.exe
O4 - HKCU\..\Run: [AdobeUpdater] C:\Program Files\Fichiers communs\Adobe\Updater5\AdobeUpdater.exe
O4 - HKCU\..\Run: [swg] C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Fichiers communs\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: DSLMON.lnk = C:\Program Files\SAGEM\SAGEM F@st 800-840\dslmon.exe
O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Program Files\HP\Digital Imaging\bin\hpqtra08.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~4\Office10\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
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
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FICHIE~1\Skype\SKYPE4~1.DLL
O23 - Service: Adobe LM Service - Adobe Systems - C:\Program Files\Fichiers communs\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Apple Mobile Device - Apple, Inc. - C:\Program Files\Fichiers communs\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - C:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
O23 - Service: avast! Web Scanner - ALWIL Software - C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
O23 - Service: AVG Anti-Spyware Guard - GRISOFT s.r.o. - C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTsvcCDA.EXE
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Service de l'iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Norman API-hooking helper (NipSvc) - Unknown owner - C:\NORMAN\Nvc\BIN\nipsvc.exe
O23 - Service: Norman NJeeves - Unknown owner - C:\NORMAN\Nvc\BIN\NJEEVES.EXE
O23 - Service: Norman ZANDA - Unknown owner - C:\Norman\NVC\BIN\Zanda.exe
O23 - Service: Norman Virus Control on-access component (nvcoas) - Norman ASA - C:\NORMAN\Nvc\BIN\nvcoas.exe
O23 - Service: Norman Virus Control Scheduler (NVCScheduler) - Norman Data Defense Systems - C:\NORMAN\Nvc\BIN\NVCSCHED.EXE
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe
O23 - Service: PC Tools Auxiliary Service (sdAuxService) - PC Tools - C:\Program Files\Spyware Doctor\svcntaux.exe
O23 - Service: PC Tools Security Service (sdCoreService) - PC Tools - C:\Program Files\Spyware Doctor\swdsvc.exe
O23 - Service: Sony SPTI Service (SPTISRV) - Sony Corporation - C:\PROGRA~1\FICHIE~1\SONYSH~1\AVLib\Sptisrv.exe
O23 - Service: StService (SServ) - Unknown owner - C:\Program Files\PCTurboPro_Free\AtlServ.exe (file missing)