Fond d'écran bleu

Bonjour à tous,

J'ai un petit problème avec mon ordi : je n'arrive plus a changer le fond d'écran du bureau. Il est devenu bleu et impossible de le changer.

Voici mon log avec hijackthis :

Logfile of HijackThis v1.99.1
Scan saved at 18:13:58, on 21/05/2007
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)

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:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\Explorer.EXE
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Program Files\Thomson\SpeedTouch USB\Dragdiag.exe
C:\Program Files\Analog Devices\SoundMAX\SMax4PNP.exe
C:\Program Files\Analog Devices\SoundMAX\Smax4.exe
C:\WINDOWS\System32\algs.exe
C:\Program Files\Java\jre1.6.0_01\bin\jusched.exe
C:\Program Files\iTunes\iTunesHelper.exe
C:\Program Files\QuickTime\qttask.exe
C:\WINDOWS\System32\kdglst.exe
C:\WINDOWS\System32\spoolvs7.exe
C:\WINDOWS\System32\conizuwh.exe
C:\WINDOWS\System32\atlyuhor.exe
C:\WINDOWS\System32\sdmvproc.exe
C:\WINDOWS\System32\dcpavss.exe
C:\WINDOWS\System32\smbssldp.exe
C:\WINDOWS\System32\itsdde.exe
C:\WINDOWS\System32\uocsizlz.exe
C:\WINDOWS\System32\dlmmsers.exe
C:\WINDOWS\System32\clockw.exe
C:\WINDOWS\System32\spoolsvc.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Windows\xpupdate.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\perfmon.exe
C:\Program Files\Analog Devices\SoundMAX\SMAgent.exe
C:\Program Files\iPod\bin\iPodService.exe
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
C:\WINDOWS\System32\wuauclt.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\WINDOWS\System32\advurgvo.exe
C:\WINDOWS\System32\orybns.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\WinRAR\WinRAR.exe
C:\Program Files\WinRAR\WinRAR.exe
C:\DOCUME~1\user\LOCALS~1\Temp\Rar$EX01.516\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.proximus.be/pickx
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.be/?gws_rd=ssl
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: Aide pour le lien d'Adobe PDF Reader - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Fichiers communs\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {11E20656-8318-4E40-9C44-0E2FB9769B78} - C:\WINDOWS\System32\rgwegire.dll
O2 - BHO: (no name) - {127A76AF-A87B-4855-8F60-DD4517B91E0D} - (no file)
O2 - BHO: (no name) - {150BB5BA-9B1F-4611-B089-EF104162782E} - (no file)
O2 - BHO: (no name) - {1A1C2BAD-078C-4660-87E0-D5E04BD4DAEB} - (no file)
O2 - BHO: (no name) - {1E721F1D-602F-41FF-B211-4DB82E5E526B} - (no file)
O2 - BHO: (no name) - {24C681D2-3015-45BD-8E37-030E10713FA3} - (no file)
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: (no name) - {58830933-1279-44B4-965F-4615959F8C71} - (no file)
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_01\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: (no name) - {CBEF571E-1590-49BA-A10A-4DF2A2C4BDEF} - (no file)
O2 - BHO: (no name) - {d9150bd1-b33f-4c04-8f4d-ce8407b36879} - C:\WINDOWS\system32\kbdave.dll
O2 - BHO: (no name) - {E2EE5C44-C66D-499d-BEAE-A2A79189A63A} - C:\WINDOWS\System32\tvovhcux.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [SpeedTouch USB Diagnostics] "C:\Program Files\Thomson\SpeedTouch USB\Dragdiag.exe" /icon
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Program Files\Analog Devices\SoundMAX\SMax4PNP.exe
O4 - HKLM\..\Run: [SoundMAX] "C:\Program Files\Analog Devices\SoundMAX\Smax4.exe" /tray
O4 - HKLM\..\Run: [Application Layer Gateway Service] C:\WINDOWS\System32\algs.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_01\bin\jusched.exe"
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [Services] C:\WINDOWS\System32\kdglst.exe
O4 - HKLM\..\Run: [SvcManager] spoolvs7.exe
O4 - HKLM\..\Run: [Spooler SubSystem App] C:\WINDOWS\System32\spoolsvc.exe
O4 - HKLM\..\Run: [oplstmb] C:\WINDOWS\System32\conizuwh.exe
O4 - HKLM\..\Run: [rsalibz] C:\WINDOWS\System32\atlyuhor.exe
O4 - HKLM\..\Run: [sysctlio] C:\WINDOWS\System32\atlyuhor.exe
O4 - HKLM\..\Run: [qsvcopl] C:\WINDOWS\System32\conizuwh.exe
O4 - HKLM\..\Run: [postlcse] C:\WINDOWS\System32\conizuwh.exe
O4 - HKLM\..\Run: [ncsysproc] C:\WINDOWS\System32\sdmvproc.exe
O4 - HKLM\..\Run: [dlcipscl] C:\WINDOWS\System32\dcpavss.exe
O4 - HKLM\..\Run: [nvipctl] C:\WINDOWS\System32\atlyuhor.exe
O4 - HKLM\..\Run: [msdlstat] C:\WINDOWS\System32\smbssldp.exe
O4 - HKLM\..\Run: [ascdps] C:\WINDOWS\System32\itsdde.exe
O4 - HKLM\..\Run: [Advanced DHTML Enable] C:\WINDOWS\System32\orybns.exe
O4 - HKLM\..\Run: [mstatdsa] C:\WINDOWS\System32\atlyuhor.exe
O4 - HKLM\..\Run: [drmconns] C:\WINDOWS\System32\dlmmsers.exe
O4 - HKLM\..\Run: [net2mudl] C:\WINDOWS\System32\conizuwh.exe
O4 - HKLM\..\Run: [Iexplore Data9 Center] C:\WINDOWS\System32\clockw.exe
O4 - HKLM\..\Run: [WindowsService] rundll32.exe "C:\WINDOWS\System32\oeknvxgi.dll",realset
O4 - HKLM\..\Run: [CalcHash] C:\WINDOWS\System32\calchash.exe
O4 - HKLM\..\Run: [timelibw] advurgvo.exe
O4 - HKLM\..\Run: [] c:\Windows\Temp.bat
O4 - HKLM\..\Run: [UserFaultCheck] %systemroot%\system32\dumprep 0 -u
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKLM\..\RunServices: [Iexplore Data9 Center] C:\WINDOWS\System32\clockw.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [rsalibz] C:\WINDOWS\System32\atlyuhor.exe
O4 - HKCU\..\Run: [sysctlio] C:\WINDOWS\System32\atlyuhor.exe
O4 - HKCU\..\Run: [ncsysproc] C:\WINDOWS\System32\sdmvproc.exe
O4 - HKCU\..\Run: [dlcipscl] C:\WINDOWS\System32\dcpavss.exe
O4 - HKCU\..\Run: [nvipctl] C:\WINDOWS\System32\atlyuhor.exe
O4 - HKCU\..\Run: [msdlstat] C:\WINDOWS\System32\smbssldp.exe
O4 - HKCU\..\Run: [ascdps] C:\WINDOWS\System32\itsdde.exe
O4 - HKCU\..\Run: [mstatdsa] C:\WINDOWS\System32\atlyuhor.exe
O4 - HKCU\..\Run: [drmconns] C:\WINDOWS\System32\dlmmsers.exe
O4 - HKCU\..\Run: [Windows update loader] C:\Windows\xpupdate.exe
O4 - HKCU\..\Run: [timelibw] advurgvo.exe
O4 - Global Startup: Adobe Reader Synchronizer.lnk = C:\Program Files\Adobe\Reader 8.0\Reader\AdobeCollabSync.exe
O4 - Global Startup: Lancement rapide d'Adobe Reader.lnk = C:\Program Files\Adobe\Reader 8.0\Reader\reader_sl.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_01\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_01\bin\ssv.dll
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O9 - Extra 'Tools' menuitem: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O10 - Unknown file in Winsock LSP: c:\windows\system32\netfilter.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\netfilter.dll
O16 - DPF: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsPAClient.cab56907.cab
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - https://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{21FC3864-302D-42E7-8786-0E39AE860923}: NameServer = 195.238.2.22 195.238.2.21
O17 - HKLM\System\CS1\Services\Tcpip\..\{21FC3864-302D-42E7-8786-0E39AE860923}: NameServer = 195.238.2.22 195.238.2.21
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: kbdave - C:\WINDOWS\SYSTEM32\kbdave.dll
O20 - Winlogon Notify: linksrv0 - linksrv0.dll (file missing)
O20 - Winlogon Notify: mlljh - C:\WINDOWS\
O20 - Winlogon Notify: winsys32 - C:\WINDOWS\System32\winsys32.dll
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - C:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: iPodService - Apple Computer, Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Performance Monitor Command Line Shell (Performance Monitor) - Unknown owner - C:\WINDOWS\perfmon.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Program Files\Analog Devices\SoundMAX\SMAgent.exe

Est-ce que quelqu'un voit quelque chose d'anormal?

D'avance merci