Pb: pc qui est lent et bloquage !!! virus...?

Bonjour à tous ,

Mon PC empire de jour en jour il se bloque pour un rien et devient tres lent . Pourtant j'ai 71% de ma memoire qui est libre donc je pense pas que ce soit un probleme de memoire . Mon PC a des antécédents avec des virus coriace ( blaster , trojan ... ) . Ma navigation sur internet devient enérvante tellement que c'est lent . J'ai essayé avec CCleaner , Spyboot , analyse anti-virus mais rien n'y fait . Mon anti-virus est F-secure .

Voila le rapport hijackthis :

Logfile of HijackThis v1.99.1
Scan saved at 14:44:33, on 23/02/2007
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\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\windows\system\hpsysdrv.exe
C:\WINDOWS\system32\ps2.exe
C:\Program Files\Pack Securite\Common\FSM32.EXE
C:\Program Files\Logitech\Video\LogiTray.exe
C:\Program Files\QuickTime\qttask.exe
C:\Program Files\Java\jre1.5.0_10\bin\jusched.exe
C:\Program Files\MSN Messenger\MsnMsgr.Exe
C:\Program Files\Messenger\MSMSGS.EXE
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\system32\rundll32.exe
C:\WINDOWS\system32\LVComsX.exe
C:\Program Files\Logitech\Video\FxSvr2.exe
C:\PROGRA~1\PACKSE~1\backweb\361343\Program\SERVIC~1.EXE
C:\Program Files\Pack Securite\Anti-Virus\fsgk32st.exe
C:\Program Files\Pack Securite\Anti-Virus\FSGK32.EXE
C:\Program Files\Pack Securite\backweb\361343\program\fsbwsys.exe
C:\Program Files\Pack Securite\Common\FSMA32.EXE
C:\Program Files\Pack Securite\backweb\361343\Program\fspex.exe
C:\Program Files\Pack Securite\Common\FSMB32.EXE
C:\WINDOWS\System32\nvsvc32.exe
C:\Program Files\Pack Securite\Anti-Virus\fssm32.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Pack Securite\Common\FCH32.EXE
C:\Program Files\Pack Securite\Common\FAMEH32.EXE
C:\Program Files\Pack Securite\FSPC\fspc.exe
C:\Program Files\Pack Securite\Anti-Virus\fsrw.exe
C:\Program Files\Pack Securite\FWES\Program\fsdfwd.exe
C:\Program Files\Pack Securite\Anti-Virus\fsav32.exe
C:\PROGRA~1\PACKSE~1\ANTI-S~1\fsaw.exe
C:\Program Files\Pack Securite\FSGUI\fsguidll.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Hijackthis Version Française\VERSION TRADUITE ORIGINALE.EXE

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = https://actus.sfr.fr
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://fr.yahoo.com/
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\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.5.0_10\bin\ssv.dll
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: Windows Live Toolbar Helper - {BDBD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\Windows Live Toolbar\msntb.dll
O3 - Toolbar: Vue HP - {B2847E28-5D7D-4DEB-8B67-05D28BCF79F5} - c:\Program Files\Hewlett-Packard\Digital Imaging\bin\hpdtlk02.dll
O3 - Toolbar: Windows Live Toolbar - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\Windows Live Toolbar\msntb.dll
O4 - HKLM\..\Run: [hpsysdrv] c:\windows\system\hpsysdrv.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\WINDOWS\System32\hkcmd.exe
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [PS2] C:\WINDOWS\system32\ps2.exe
O4 - HKLM\..\Run: [F-Secure Manager] "C:\Program Files\Pack Securite\Common\FSM32.EXE" /splash
O4 - HKLM\..\Run: [F-Secure TNB] "C:\Program Files\Pack Securite\TNB\TNBUtil.exe" /CHECKALL /WAITFORSW
O4 - HKLM\..\Run: [F-Secure Startup Wizard] "C:\Program Files\Pack Securite\FSGUI\FSSW.EXE" /reboot
O4 - HKLM\..\Run: [LogitechVideoTray] C:\Program Files\Logitech\Video\LogiTray.exe
O4 - HKLM\..\Run: [LogitechVideoRepair] C:\Program Files\Logitech\Video\ISStart.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.5.0_10\bin\jusched.exe"
O4 - HKCU\..\Run: [NVIEW] rundll32.exe nview.dll,nViewLoadHook
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\MSMSGS.EXE" /background
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - Global Startup: Pack Securite.lnk = C:\Program Files\Pack Securite\backweb\361343\Program\fspex.exe
O8 - Extra context menu item: &Bloquer cette fenêtre publicitaire - C:\Program Files\Pack Securite\Anti-Spyware\blockpopups.htm
O8 - Extra context menu item: &Windows Live Search - res://C:\Program Files\Windows Live Toolbar\msntb.dll/search.htm
O10 - Broken Internet access because of LSP provider 'winsflt.dll' missing
O11 - Options group: [INTERNATIONAL] International*
O16 - DPF: {30528230-99f7-4bb4-88d8-fa1d4f56a2ab} (YInstStarter Class) - C:\Program Files\Yahoo!\Common\yinsthelper.dll
O16 - DPF: {31B7EB4E-8B4B-11D1-A789-00A0CC6651A8} (Cult3D ActiveX Player) - http://host.cycore.net/plugins/windows/ie/Cult3D_IE_5.3.0.228.cab
O16 - DPF: {5D86DDB5-BDF9-441B-9E9E-D4730F4EE499} (BDSCANONLINE Control) - http://www.bitdefender.fr/scan8/oscan8.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/...
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsClient.cab31267.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{28988D0E-FF1C-4DE2-863A-DFB920DABA03}: NameServer = 84.103.237.142 86.64.145.142
O17 - HKLM\System\CS1\Services\Tcpip\..\{28988D0E-FF1C-4DE2-863A-DFB920DABA03}: NameServer = 84.103.237.142 86.64.145.142
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: igfxcui - C:\WINDOWS\SYSTEM32\igfxsrvc.dll
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O23 - Service: Pack Securite (BackWeb Plug-in - 361343) - BackWeb Technologies Inc. - C:\PROGRA~1\PACKSE~1\backweb\361343\Program\SERVIC~1.EXE
O23 - Service: FSGKHS (F-Secure Gatekeeper Handler Starter) - F-Secure Corp. - C:\Program Files\Pack Securite\Anti-Virus\fsgk32st.exe
O23 - Service: fsbwsys - F-Secure Corp. - C:\Program Files\Pack Securite\backweb\361343\program\fsbwsys.exe
O23 - Service: F-Secure Anti-Virus Firewall Daemon (FSDFWD) - F-Secure Corporation - C:\Program Files\Pack Securite\FWES\Program\fsdfwd.exe
O23 - Service: F-Secure HTTP Server (fshttps) - F-Secure Corporation - C:\Program Files\Pack Securite\FSPC\fshttps\fshttps.exe
O23 - Service: F-Secure Management Agent (FSMA) - F-Secure Corporation - C:\Program Files\Pack Securite\Common\FSMA32.EXE
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe

Merci de m'aider car j'en ai besoin s'il vous plait je suis désésperée !!!!!!