Virus sur pc sous vista?

Bonjour,
Voilà, je pense que mon pc est infecté, parce que depuis quelques jours, mon pc rame et je suis de l'éteindre de force. A ce moment là, il n'y que ma souris qui marche, je ne peut cliquer sur aucune icône, comme si c'était en impression écran. J'ai déjà eu ce problème auparavant, je suis donc allé à la Fnac pour voir quel était le problème. On m'a dit qu'il fallait formater mon pc mais j'ai perdu tout mes fichiers et la je voudrais savoir s'il y avait un moyen de supprimer le virus pour garder mes fichiers, cette fois-ci, vu que je n'ai pas de disque dur externe.

Merci d'avance

Voici le le fichier Log:

Logfile of random's system information tool 1.06 (written by random/random)
Run by Nelly at 2009-08-06 21:06:51
Microsoft® Windows Vista™ Édition Familiale Premium
System drive C: has 36 GB (16%) free of 226 GB
Total RAM: 2046 MB (49% free)

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 21:07:19, on 06/08/2009
Platform: Windows Vista (WinNT 6.00.1904)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
Boot mode: Normal

Running processes:
C:\Windows\system32\taskeng.exe
C:\Windows\system32\Dwm.exe
C:\Windows\Explorer.EXE
C:\Users\Nelly\AppData\Roaming\eoRezo\SoftwareUpdate\SoftwareUpdateHP.exe
C:\Program Files\Common Files\LightScribe\LightScribeControlPanel.exe
C:\Program Files\Veoh Networks\VeohWebPlayer\veohwebplayer.exe
C:\Program Files\Windows Media Player\wmpnscfg.exe
C:\Program Files\Windows Live\Messenger\msnmsgr.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Windows\system32\wuauclt.exe
C:\Windows\system32\SearchFilterHost.exe
C:\Program Files\Opera\opera.exe
C:\Users\Nelly\Desktop\RSIT.exe
C:\Program Files\trend micro\Nelly.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://y.lo.st
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://ie.redirect.hp.com/...
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 = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.msn.com/fr-fr?cobrand=hp-notebook.msn.com&ocid=HPDHP&pc=HPNTDF
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O1 - Hosts: ::1 localhost
O2 - BHO: Aide pour le lien d'Adobe PDF Reader - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: NCO 2.0 IE BHO - {602ADB0E-4AFF-4217-8AA1-95DAC4DFA408} - c:\Program Files\Common Files\Symantec Shared\coShared\Browser\2.0\coIEPlg.dll
O2 - BHO: Symantec Intrusion Prevention - {6D53EC84-6AAE-4787-AEEE-F4628F01010C} - C:\PROGRA~1\COMMON~1\SYMANT~1\IDS\IPSBHO.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre6\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O3 - Toolbar: Show Norton Toolbar - {7FEBEFE3-6B19-4349-98D2-FFB09D4B49CA} - c:\Program Files\Common Files\Symantec Shared\coShared\Browser\2.0\CoIEPlg.dll
O3 - Toolbar: Veoh Web Player Video Finder - {0FBB9689-D3D7-4f7a-A2E2-585B10099BFC} - C:\Program Files\Veoh Networks\VeohWebPlayer\VeohIEToolbar.dll
O4 - HKLM\..\RunOnce: [SoftwareHelper] C:\Users\Nelly\AppData\Roaming\eoRezo\SoftwareUpdate\SoftwareUpdateHP.exe -runonce
O4 - HKCU\..\Run: [LightScribe Control Panel] C:\Program Files\Common Files\LightScribe\LightScribeControlPanel.exe -hidden
O4 - HKCU\..\Run: [VeohPlugin] "C:\Program Files\Veoh Networks\VeohWebPlayer\veohwebplayer.exe"
O4 - HKCU\..\Run: [WMPNSCFG] C:\Program Files\Windows Media Player\WMPNSCFG.exe
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /detectMem (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-19\..\Run: [WindowsWelcomeCenter] rundll32.exe oobefldr.dll,ShowWelcomeCenter (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /detectMem (User 'SERVICE RÉSEAU')
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~3\Office12\EXCEL.EXE/3000
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~3\Office12\REFIEBAR.DLL
O13 - Gopher Prefix:
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files\Common Files\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: Planificateur LiveUpdate automatique (Automatic LiveUpdate Scheduler) - Symantec Corporation - c:\Program Files\Symantec\LiveUpdate\AluSchedulerSvc.exe
O23 - Service: Service Bonjour (Bonjour Service) - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - c:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe
O23 - Service: Symantec Settings Manager (ccSetMgr) - Symantec Corporation - c:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe
O23 - Service: Symantec Lic NetConnect service (CLTNetCnService) - Symantec Corporation - c:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe
O23 - Service: Com4Qlb - Hewlett-Packard Development Company, L.P. - C:\Program Files\Hewlett-Packard\HP Quick Launch Buttons\Com4Qlb.exe
O23 - Service: COM Host (comHost) - Symantec Corporation - c:\Program Files\Common Files\Symantec Shared\VAScanner\comHost.exe
O23 - Service: HP Health Check Service - Hewlett-Packard - c:\Program Files\Hewlett-Packard\HP Health Check\hphc_service.exe
O23 - Service: hpqwmiex - Hewlett-Packard Development Company, L.P. - C:\Program Files\Hewlett-Packard\Shared\hpqwmiex.exe
O23 - Service: Intel(R) Matrix Storage Event Monitor (IAANTMON) - Intel Corporation - C:\Program Files\Intel\Intel Matrix Storage Manager\IAANTMon.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Service de l’iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - C:\Program Files\Common Files\LightScribe\LSSrvc.exe
O23 - Service: LiveUpdate - Symantec Corporation - c:\Program Files\Symantec\LiveUpdate\LuComServer_3_4.EXE
O23 - Service: LiveUpdate Notice - Symantec Corporation - c:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe
O23 - Service: QuickPlay Background Capture Service (QBCS) (QPCapSvc) - Unknown owner - C:\Program Files\HP\QuickPlay\Kernel\TV\QPCapSvc.exe
O23 - Service: QuickPlay Task Scheduler (QTS) (QPSched) - Unknown owner - C:\Program Files\HP\QuickPlay\Kernel\TV\QPSched.exe
O23 - Service: Symantec Core LC - Unknown owner - C:\PROGRA~1\COMMON~1\SYMANT~1\CCPD-LC\symlcsvc.exe