Netbook très lent et analyse hijackthis

Bonjour,

J'ai acheté un netbook Samsung N150 il y a quelques mois, et depuis quelques temps il est très lent au démarrage et surtout pendant que je l'utilise. J'ai supprimé tous les fichiers qui n'étaient pas indispensables (films, musiques...) mais il reste toujours ausi lent.
Sur les 108 Go de mon disque dur C, il m'en reste 79,4 qui sont libres et je ne comprend toujours pas pourquoi l'ordi est lent.
J'ai fait une analyse hijackthis et voici ce que ça donne :

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 07:56:59, on 27/07/2011
Platform: Unknown Windows (WinNT 6.01.3504)
MSIE: Internet Explorer v9.00 (9.00.8112.16421)
Boot mode: Normal

Running processes:
C:\windows\system32\taskhost.exe
C:\windows\system32\taskeng.exe
C:\windows\system32\Dwm.exe
C:\Program Files\Samsung\Samsung Recovery Solution 4\WCScheduler.exe
C:\Program Files\Samsung\Samsung Support Center\SSCKbdHk.exe
C:\Program Files\SAMSUNG\EasySpeedUpManager\EasySpeedUpManager.exe
C:\Program Files\Samsung\Easy Display Manager\dmhkcore.exe
C:\windows\Explorer.EXE
C:\Program Files\Realtek\Audio\HDA\RtHDVCpl.exe
C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
C:\Program Files\AnyPC Client\APLangApp.exe
C:\Program Files\Common Files\Java\Java Update\jusched.exe
C:\Windows\System32\igfxtray.exe
C:\Windows\System32\hkcmd.exe
C:\Windows\System32\igfxpers.exe
C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 2011\avp.exe
C:\Program Files\Common Files\Research In Motion\USB Drivers\RIMBBLaunchAgent.exe
C:\windows\system32\igfxsrvc.exe
C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
C:\Program Files\Windows Sidebar\sidebar.exe
C:\windows\system32\igfxext.exe
C:\windows\system32\igfxsrvc.exe
C:\Program Files\Synaptics\SynTP\SynTPHelper.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Common Files\Research In Motion\RIMDeviceManager\RIMDeviceManager.exe
C:\Program Files\Common Files\Research In Motion\USB Drivers\BbDevMgr.exe
C:\Program Files\Mozilla Firefox\plugin-container.exe
C:\Program Files\Mozilla Firefox\plugin-container.exe
C:\windows\system32\taskhost.exe
C:\windows\system32\wuauclt.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://fr.msn.com/?ocid=OIE9HP
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft....k/?LinkId=54896
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.ca/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft....k/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft....k/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft....k/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft....k/?LinkId=69157
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Internet Explorer, optimized for Bing and MSN
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - URLSearchHook: (no name) - {0EBBBE48-BAD4-4B4C-8E5A-516ABECAE064} - (no file)
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: McAfee Phishing Filter - {27B4851A-3207-45A2-B947-BE8AFE6163AB} - (no file)
O2 - BHO: IEVkbdBHO - {59273AB4-E7D3-40F9-A1A8-6FA9CCA1862C} - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 2011\ievkbd.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - C:\Program Files\Google\Google Toolbar\GoogleToolbar_32.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\5.5.4723.1820\swg.dll
O2 - BHO: (no name) - {B164E929-A1B6-4A06-B104-2CD0E90A88FF} - (no file)
O2 - BHO: Java(TM) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O2 - BHO: link filter bho - {E33CF602-D945-461A-83F0-819F76A199F8} - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 2011\klwtbbho.dll
O3 - Toolbar: Google Toolbar - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - C:\Program Files\Google\Google Toolbar\GoogleToolbar_32.dll
O4 - HKLM\..\Run: [RtHDVCpl] C:\Program Files\Realtek\Audio\HDA\RtHDVCpl.exe -s
O4 - HKLM\..\Run: [SynTPEnh] %ProgramFiles%\Synaptics\SynTP\SynTPEnh.exe
O4 - HKLM\..\Run: [APLangApp] "C:\Program Files\AnyPC Client\APLangApp.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 9.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [UCam_Menu] "C:\Program Files\CyberLink\YouCam\MUITransfer\MUIStartMenu.exe" "C:\Program Files\CyberLink\YouCam" UpdateWithCreateOnce "Software\CyberLink\YouCam\2.0"
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Common Files\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [IgfxTray] C:\windows\system32\igfxtray.exe
O4 - HKLM\..\Run: [HotKeysCmds] C:\windows\system32\hkcmd.exe
O4 - HKLM\..\Run: [Persistence] C:\windows\system32\igfxpers.exe
O4 - HKLM\..\Run: [AVP] "C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 2011\avp.exe"
O4 - HKLM\..\Run: [RIMBBLaunchAgent.exe] C:\Program Files\Common Files\Research In Motion\USB Drivers\RIMBBLaunchAgent.exe
O4 - HKCU\..\Run: [swg] "C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe"
O4 - HKCU\..\Run: [Software Informer] "C:\Program Files\Software Informer\softinfo.exe" -autorun
O4 - HKCU\..\Run: [cacaoweb] "C:\Users\Jeannette\AppData\Roaming\cacaoweb\cacaoweb.exe" -noplayer
O4 - HKCU\..\Run: [Sidebar] C:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\Windows Live\Messenger\msnmsgr.exe" /background
O4 - HKCU\..\RunOnce: [FlashPlayerUpdate] C:\windows\system32\Macromed\Flash\FlashUtil10n_Plugin.exe -update plugin
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-19\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-20\..\RunOnce: [mctadmin] C:\Windows\System32\mctadmin.exe (User 'SERVICE RÉSEAU')
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~3\Office12\EXCEL.EXE/3000
O8 - Extra context menu item: Google Sidewiki... - res://C:\Program Files\Google\Google Toolbar\Component\GoogleToolbarDynamic_mui_en_96D6FF0C6D236BF8.dll/cmsidewiki.html
O9 - Extra button: Envoyer à OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~3\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: &Envoyer à OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~3\Office12\ONBttnIE.dll
O9 - Extra button: Clavier &virtuel - {4248FE82-7FCB-46AC-B270-339F08212110} - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 2011\klwtbbho.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~3\Office12\REFIEBAR.DLL
O9 - Extra button: Analyse des &liens - {CCF151D8-D089-449F-A5A4-D9909053F20F} - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 2011\klwtbbho.dll
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O13 - Gopher Prefix:
O18 - Protocol: dssrequest - {5513F07E-936B-4E52-9B00-067394E91CC5} - (no file)
O18 - Protocol: sacore - {5513F07E-936B-4E52-9B00-067394E91CC5} - (no file)
O23 - Service: Kaspersky Anti-Virus Service (AVP) - Kaspersky Lab ZAO - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 2011\avp.exe
O23 - Service: Service Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Service Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Google Software Updater (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: Oberon Media Game Console service (OberonGameConsoleService) - Unknown owner - C:\Program Files\Samsung Casual Games\GameConsole\OberonGameConsoleService.exe
O23 - Service: Rezip - Unknown owner - C:\windows\SYSTEM32\Rezip.exe