Recherche de virus et Malware sur mon pc

Bonjour, j'ai des soucis sur mon pc, je sais pas si cela viens d'un virus ou d'un Malware .. j'ai fait un scan avec HijackThis et voici le Log. Quelqu'un aurait la gentillesse de regarder si un truc qui ne va pas svp :)

Voici le Log:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 20:12:59, on 29/07/2012
Platform: Unknown Windows (WinNT 6.01.3505 SP1)
MSIE: Internet Explorer v8.00 (8.00.7601.17514)
Boot mode: Normal

Running processes:
C:\Windows\system32\Dwm.exe
C:\Windows\system32\taskhost.exe
C:\Windows\Explorer.EXE
C:\Program Files\AVAST Software\Avast\AvastUI.exe
C:\Program Files\Elaborate Bytes\VirtualCloneDrive\VCDDaemon.exe
C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\MOM.exe
C:\Program Files\SweetIM\Messenger\SweetIM.exe
C:\Program Files\SweetIM\Communicator\SweetPacksUpdateManager.exe
C:\Program Files\Java\jre1.6.0_03\bin\jusched.exe
C:\Program Files\Steam\Steam.exe
C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\CCC.exe
C:\Users\Markzeloz\AppData\Roaming\Spotify\spotify.exe
C:\Users\Markzeloz\AppData\Roaming\Spotify\Data\SpotifyWebHelper.exe
C:\Program Files\OpenOffice.org 2.3\program\soffice.exe
C:\Program Files\OpenOffice.org 2.3\program\soffice.BIN
C:\Program Files\Skype\Phone\Skype.exe
C:\Users\Markzeloz\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Markzeloz\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Markzeloz\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Windows\system32\rundll32.exe
C:\Users\Markzeloz\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Markzeloz\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Markzeloz\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Markzeloz\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Markzeloz\Downloads\DCGExtensionScript2.2.exe
C:\Users\Markzeloz\Downloads\HiJackThis.exe
C:\Users\Markzeloz\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Program Files\Internet Explorer\IELowutil.exe
C:\Windows\system32\SearchFilterHost.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://home.sweetim.com/?crg=3.1010000.10015
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://home.sweetim.com/?crg=3.1010000.10015
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - URLSearchHook: SweetIM ToolbarURLSearchHook Class - {EEE6C35D-6118-11DC-9C72-001320C79847} - C:\Program Files\SweetIM\Toolbars\Internet Explorer\mgHelper.dll
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O2 - BHO: avast! WebRep - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - C:\Program Files\AVAST Software\Avast\aswWebRepIE.dll
O2 - BHO: SWEETIE - {EEE6C35C-6118-11DC-9C72-001320C79847} - C:\Program Files\SweetIM\Toolbars\Internet Explorer\mgToolbarIE.dll
O3 - Toolbar: avast! WebRep - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - C:\Program Files\AVAST Software\Avast\aswWebRepIE.dll
O3 - Toolbar: SweetPacks Toolbar for Internet Explorer - {EEE6C35B-6118-11DC-9C72-001320C79847} - C:\Program Files\SweetIM\Toolbars\Internet Explorer\mgToolbarIE.dll
O4 - HKLM\..\Run: [StartCCC] "C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\CLIStart.exe" MSRun
O4 - HKLM\..\Run: [avast] "C:\Program Files\AVAST Software\Avast\avastUI.exe" /nogui
O4 - HKLM\..\Run: [VirtualCloneDrive] "C:\Program Files\Elaborate Bytes\VirtualCloneDrive\VCDDaemon.exe" /s
O4 - HKLM\..\Run: [SweetIM] C:\Program Files\SweetIM\Messenger\SweetIM.exe
O4 - HKLM\..\Run: [Sweetpacks Communicator] C:\Program Files\SweetIM\Communicator\SweetPacksUpdateManager.exe
O4 - HKLM\..\Run: [Adobe ARM] "C:\Program Files\Common Files\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_03\bin\jusched.exe"
O4 - HKCU\..\Run: [Google Update] "C:\Users\Markzeloz\AppData\Local\Google\Update\GoogleUpdate.exe" /c
O4 - HKCU\..\Run: [Skype] "C:\Program Files\Skype\Phone\Skype.exe" /minimized /regrun
O4 - HKCU\..\Run: [Steam] "C:\Program Files\Steam\Steam.exe" -silent
O4 - HKCU\..\Run: [Spotify] "C:\Users\Markzeloz\AppData\Roaming\Spotify\Spotify.exe" /uri spotify:autostart
O4 - HKCU\..\Run: [Spotify Web Helper] "C:\Users\Markzeloz\AppData\Roaming\Spotify\Data\SpotifyWebHelper.exe"
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')
O4 - Startup: OpenOffice.org 2.3.lnk = C:\Program Files\OpenOffice.org 2.3\program\quickstart.exe
O8 - Extra context menu item: Rechercher sur le Web - C:\Program Files\SweetIM\Toolbars\Internet Explorer\resources\menuext.html
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
O13 - Gopher Prefix:
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\COMMON~1\Skype\SKYPE4~1.DLL
O23 - Service: Adobe Acrobat Update Service (AdobeARMservice) - Adobe Systems Incorporated - C:\Program Files\Common Files\Adobe\ARM\1.0\armsvc.exe
O23 - Service: Adobe Flash Player Update Service (AdobeFlashPlayerUpdateSvc) - Adobe Systems Incorporated - C:\Windows\system32\Macromed\Flash\FlashPlayerUpdateService.exe
O23 - Service: AMD External Events Utility - AMD - C:\Windows\system32\atiesrxx.exe
O23 - Service: avast! Antivirus - AVAST Software - C:\Program Files\AVAST Software\Avast\AvastSvc.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Mozilla Maintenance Service (MozillaMaintenance) - Mozilla Foundation - C:\Program Files\Mozilla Maintenance Service\maintenanceservice.exe
O23 - Service: Skype Updater (SkypeUpdate) - Skype Technologies - C:\Program Files\Skype\Updater\Updater.exe
O23 - Service: Steam Client Service - Valve Corporation - C:\Program Files\Common Files\Steam\SteamService.exe
O23 - Service: TeamViewer 7 (TeamViewer7) - TeamViewer GmbH - C:\Program Files\TeamViewer\Version7\TeamViewer_Service.exe