Lenteur de mon pc

Bonjour,

pour pc est lent à mourir, est-ce quelqu'un serait aimable de m'aider. Merci ! ci-dessous le rapport sur Hijackthis :
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 21:34:50, on 2010-11-24
Platform: Unknown Windows (WinNT 6.01.3504)
MSIE: Internet Explorer v9.00 (9.00.7930.16406)
Boot mode: Normal

Running processes:
C:\Windows\system32\taskhost.exe
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Windows\System32\igfxtray.exe
C:\Windows\System32\hkcmd.exe
C:\Windows\System32\igfxpers.exe
C:\Windows\system32\igfxsrvc.exe
C:\Program Files\Common Files\Java\Java Update\jusched.exe
C:\Program Files\Microsoft IntelliPoint\ipoint.exe
C:\Program Files\Winstep\Nexus.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Users\Billy Vinya\Downloads\HiJackThis.exe
C:\Windows\system32\wuauclt.exe
C:\Windows\system32\DllHost.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O3 - Toolbar: (no name) - {CCC7A320-B3CA-4199-B1A6-9F516DD69829} - (no file)
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: [SunJavaUpdateSched] "C:\Program Files\Common Files\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [Ink Monitor] C:\Program Files\EPSON\Ink Monitor\InkMonitor.exe
O4 - HKLM\..\Run: [IntelliPoint] "c:\Program Files\Microsoft IntelliPoint\ipoint.exe"
O4 - HKCU\..\Run: [Nexus] C:\Program Files\Winstep\Nexus.exe autostart
O4 - HKCU\..\Run: [RegistryBooster] "C:\Program Files\Uniblue\RegistryBooster\launcher.exe" delay 20000
O11 - Options group: [ACCELERATED_GRAPHICS] Accelerated graphics
O13 - Gopher Prefix:
O16 - DPF: {67DABFBF-D0AB-41FA-9C46-CC0F21721616} - http://download.divx.com/player/DivXBrowserPlugin.cab
O16 - DPF: {E2883E8F-472F-4FB0-9522-AC9BF37916A7} - http://platformdl.adobe.com/NOS/getPlusPlus/1.6/gp.cab
O23 - Service: Service Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files\Google\Update\GoogleUpdate.exe
O23 - Service: Winstep Xtreme Service - Unknown owner - C:\Program.exe (file missing)