Mon pc est très lent

Bonjour,
Voilà depuis environ 1 mois mon pc est d'1 lenteur exaspérante.
J'ai fait nettoyage de disque, défragmentation et même restauration de système et bien sûr 1 analyse de l'ordi( trouvé qq trojans mais résolu et mon ordi est propre apparement) mais rien n'y change.
Voilà ma configuration:
Microsoft Windows XP Home Edition
Service Pack du système Service Pack 2
DirectX 4.09.00.0904 (DirectX 9.0c)
Nom du système 402850300000 (Maison)
Nom de l'utilisateur Annick

Carte mère:
Type de processeur Intel Pentium 4 515, 2933 MHz (22 x 133)
Nom de la carte mère Gigabyte GA-8I915PM (2 PCI, 1 PCI-E x1, 1 PCI-E x16, 4 DDR DIMM, Audio, LAN)
Chipset de la carte mère Intel Grantsdale i915P
Mémoire système 512 Mo (PC3200 DDR SDRAM)
Type de BIOS Award Medallion (09/09/04)
Port de communication Port de communication (COM1)
Port de communication Port de communication (COM2)
Port de communication Port imprimante ECP (LPT1)

Moniteur:
Carte vidéo RADEON X300 Series Secondary (128 Mo)
Carte vidéo RADEON X300 Series (128 Mo)
Accélérateur 3D ATI Radeon X300 (RV370)
Moniteur Écran Plug-and-Play [NoDB] (607DD3XCA4369)

Multimédia:
Carte audio Intel 82801FB ICH6 - High Definition Audio Controller [B-1]

Stockage:
Contrôleur IDE Intel(R) 82801FB Ultra ATA Storage Controllers - 2651
Disque dur ST3160023AS (160 Go, 7200 RPM, SATA)
Disque dur GENERIC USB Storage-SMC USB Device
Disque dur GENERIC USB Storage-CFC USB Device
Disque dur GENERIC USB Storage-SDC USB Device
Disque dur GENERIC USB Storage-MSC USB Device
Lecteur optique _NEC DVD_RW ND-3500AG (DVD+R9:4x, DVD+RW:16x/4x, DVD-RW:16x/4x, DVD-ROM:16x, CD:48x/24x/48x DVD+RW/DVD-RW)
Lecteur optique LITE-ON DVD SOHD-167T (16x/48x DVD-ROM)
État des disques durs SMART OK

Partitions:
C: (NTFS) 147497 Mo (57625 Mo libre)

Entrée:
Clavier Logitech PS/2 Keyboard
Souris Microsoft PS/2 Port Mouse (IntelliPoint)
Souris Microsoft USB Wheel Mouse Optical (IntelliPoint)

Réseau:
Carte réseau Realtek RTL8139/810x Family Fast Ethernet NIC (192.168.1.2)
Modem Smart Link 56K Modem

Périphériques:
Imprimante hp psc 700 series
Contrôleur USB1 Intel 82801FB ICH6 - USB Universal Host Controller [B-1]
Contrôleur USB1 Intel 82801FB ICH6 - USB Universal Host Controller [B-1]
Contrôleur USB1 Intel 82801FB ICH6 - USB Universal Host Controller [B-1]
Contrôleur USB1 Intel 82801FB ICH6 - USB Universal Host Controller [B-1]
Contrôleur USB2 Intel 82801FB ICH6 - Enhanced USB2 Controller [B-1]
Périphérique USB Logitech Mic (Communicate)
Périphérique USB Logitech QuickCam Communicate
Périphérique USB Logitech USB Camera (Communicate)
Périphérique USB Périphérique de stockage de masse USB
Périphérique USB Souris Microsoft USB Wheel Mouse Optical

J'ai aussi utilisé hijacthis mais je n'y comprends rien: ci dessous le rapport:
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 15:34:51, on 12/11/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16544)
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\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\drivers\CDAC11BA.EXE
C:\WINDOWS\SOUNDMAN.EXE
C:\Program Files\Fichiers communs\Microsoft Shared\VS7Debug\mdm.exe
C:\Program Files\Java\jre1.6.0_03\bin\jusched.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Program Files\Fichiers communs\NMSAccessU.exe
C:\Program Files\Logitech\Video\LogiTray.exe
C:\WINDOWS\system32\PSIService.exe
C:\Program Files\CyberLink\PowerDVD\PDVDServ.exe
C:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe
C:\Program Files\Hewlett-Packard\HP Share-to-Web\hpgs2wnd.exe
C:\PROGRA~1\HEWLET~1\HPSHAR~1\hpgs2wnf.exe
C:\Program Files\MessengerPlus! 3\MsgPlus.exe
C:\Program Files\Spyware Doctor\SDTrayApp.exe
C:\Program Files\CyberLink\Shared Files\RichVideo.exe
C:\Program Files\Corel\Corel Snapfire\Corel Photo Downloader.exe
C:\Program Files\Spyware Doctor\svcntaux.exe
C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Hewlett-Packard\AiO\hp psc 700 series\Bin\hpobrt07.exe
C:\Program Files\Logitech\SetPoint\KEM.exe
C:\Program Files\Spyware Doctor\swdsvc.exe
C:\Program Files\Logitech\SetPoint\KHALMNPR.EXE
C:\WINDOWS\system32\LVComsX.exe
C:\Program Files\Logitech\Video\FxSvr2.exe
C:\PROGRA~1\HEWLET~1\AiO\Shared\Bin\hpoevm07.exe
C:\WINDOWS\system32\slserv.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Hewlett-Packard\AiO\Shared\bin\hpOSTS07.exe
C:\WINDOWS\System32\alg.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\Program Files\MSN Messenger\usnsvc.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WLLoginProxy.exe
C:\Program Files\WinRAR\WinRAR.exe
C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
C:\DOCUME~1\Annick\LOCALS~1\Temp\Rar$EX18.781\HijackThis.exe
C:\WINDOWS\system32\wbem\wmiprvse.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://portail.free.fr/
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
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Alice ADSL
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = localhost
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
R3 - URLSearchHook: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn0\yt.dll
O2 - BHO: Yahoo! Toolbar Helper - {02478D38-C3F9-4EFB-9B51-7695ECA05670} - C:\Program Files\Yahoo!\Companion\Installs\cpn0\yt.dll
O2 - BHO: Aide pour le lien d'Adobe PDF Reader - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Fichiers communs\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: Download Manager Browser Helper Object - {19C8E43B-07B3-49CB-BFFC-6777B593E6F8} - C:\PROGRA~1\FICHIE~1\fluxDVD\DOWNLO~1\XEBDLH~1.DLL
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: (no name) - {64F56FC1-1272-44CD-BA6E-39723696E350} - (no file)
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\googletoolbar1.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\2.0.301.7164\swg.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn0\yt.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar1.dll
O4 - HKLM\..\Run: [Raccourci vers la page des propriétés de High Definition Audio] HDAudPropShortcut.exe
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_03\bin\jusched.exe"
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [LogitechVideoRepair] C:\Program Files\Logitech\Video\ISStart.exe
O4 - HKLM\..\Run: [LogitechVideoTray] C:\Program Files\Logitech\Video\LogiTray.exe
O4 - HKLM\..\Run: [RemoteControl] "C:\Program Files\CyberLink\PowerDVD\PDVDServ.exe"
O4 - HKLM\..\Run: [TkBellExe] "C:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe" -osboot
O4 - HKLM\..\Run: [Share-to-Web Namespace Daemon] C:\Program Files\Hewlett-Packard\HP Share-to-Web\hpgs2wnd.exe
O4 - HKLM\..\Run: [umndqdfnea] c:\windows\system32\umndqdfnea.exe umndqdfnea
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [MessengerPlus3] "C:\Program Files\MessengerPlus! 3\MsgPlus.exe"
O4 - HKLM\..\Run: [SDTray] "C:\Program Files\Spyware Doctor\SDTrayApp.exe"
O4 - HKLM\..\Run: [Corel Photo Downloader] C:\Program Files\Corel\Corel Snapfire\Corel Photo Downloader.exe
O4 - HKCU\..\Run: [LogitechSoftwareUpdate] "C:\Program Files\Logitech\Video\ManifestEngine.exe" boot
O4 - HKCU\..\Run: [swg] C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
O4 - HKCU\..\Run: [LDM] \Program\BackWeb-8876480.exe
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.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: HPAiODevice(hp psc 700 series) - 1.lnk = C:\Program Files\Hewlett-Packard\AiO\hp psc 700 series\Bin\hpobrt07.exe
O4 - Global Startup: Logitech Desktop Messenger.lnk = C:\Program Files\Logitech\Desktop Messenger\8876480\Program\LDMConf.exe
O4 - Global Startup: Logitech SetPoint.lnk = C:\Program Files\Logitech\SetPoint\KEM.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~3\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: Real.com - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - C:\WINDOWS\system32\Shdocvw.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
O14 - IERESET.INF: START_PAGE_URL=file://C:\APPS\IE\offline\fr.htm
O15 - Trusted Zone: *.canalplay.com (HKLM)
O15 - Trusted Zone: *.canalplusactive.com (HKLM)
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://download.microsoft.com/download/E/5/6/E5611B10-0D6D-4117-8430-A67417AA88CD/LegitCheckControl.cab
O16 - DPF: {215B8138-A3CF-44C5-803F-8226143CFC0A} (Trend Micro ActiveX Scan Agent 6.6) - http://eu-housecall.trendmicro-europe.com/housecall/applet/html/native/x86/win32/activex/hcImpl.cab
O16 - DPF: {4F1E5B1A-2A80-42CA-8532-2D05CB959537} (MSN Photo Upload Tool) - http://gfx2.hotmail.com/mail/w2/pr02/resources/MSNPUpld.cab
O16 - DPF: {5D6F45B3-9043-443D-A792-115447494D24} (UnoCtrl Class) - http://messenger.zone.msn.com/FR-FR/a-UNO1/GAME_UNO1.cab
O16 - DPF: {5ED80217-570B-4DA9-BF44-BE107C0EC166} (Windows Live Safety Center Base Module) - http://cdn.scan.onecare.live.com/resource/download/scanner/wlscbase2895.cab
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://update.microsoft.com/...
O16 - DPF: {6E5E167B-1566-4316-B27F-0DDAB3484CF7} (Image Uploader Control) - http://www.mypix.com/fr/fr/importer/ImageUploader4.cab
O16 - DPF: {8F48147B-78D9-40F9-ACC0-BDDE59B246F4} (AccountHelper Class) - http://abonnement.aliceadsl.fr/configurateur/AccountHelper.cab
O16 - DPF: {B8BE5E93-A60C-4D26-A2DC-220313175592} (MSN Games - Installer) - http://messenger.zone.msn.com/binary/ZIntro.cab56649.cab
O16 - DPF: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsPAClient.cab56907.cab
O16 - DPF: {E1AF091A-9F23-4059-89D7-C05EE073285D} - https://www.canalplus.com/canalplay/
O16 - DPF: {E6187999-9FEC-46A1-A20F-F4CA977D5643} (ZoneChess Object) - http://messenger.zone.msn.com/binary/Chess.cab57176.cab
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.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: Boonty Games - BOONTY - C:\Program Files\Fichiers communs\BOONTY Shared\Service\Boonty.exe
O23 - Service: C-DillaCdaC11BA - Macrovision - C:\WINDOWS\system32\drivers\CDAC11BA.EXE
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: MysqlInventime - Unknown owner - c:\mysql\bin\mysqld-nt.exe
O23 - Service: NBService - Nero AG - C:\Program Files\Nero\Nero 7\Nero BackItUp\NBService.exe
O23 - Service: NMIndexingService - Nero AG - C:\Program Files\Fichiers communs\Ahead\Lib\NMIndexingService.exe
O23 - Service: NMSAccessU - Unknown owner - C:\Program Files\Fichiers communs\NMSAccessU.exe
O23 - Service: ProtexisLicensing - Unknown owner - C:\WINDOWS\system32\PSIService.exe
O23 - Service: Cyberlink RichVideo Service(CRVS) (RichVideo) - Unknown owner - C:\Program Files\CyberLink\Shared Files\RichVideo.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: SmartLinkService (SLService) - - C:\WINDOWS\SYSTEM32\slserv.exe