Salut,
tu peux fixer ceci:
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://g.msn.fr/0SEFRFR/SAOS02
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://fr.rd.yahoo.com/customize/ie/defaults/su/msgr7/*http://fr.search.yahoo.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://fr.rd.yahoo.com/customize/ie/defaults/sp/msgr7/*http://fr.search.yahoo.com
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Startpagina = about:blank
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Koppelingen
R3 - URLSearchHook: (no name) - _{CFBFAE00-17A6-11D0-99CB-00C04FD64497} - (no file)
O2 - BHO: BHObj Class - {00000010-6F7D-442C-93E3-4A4827C2E4C8} - C:\WINDOWS\nem220.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: RXResultTracker Class - {59879FA4-4790-461c-A1CC-4EC4DE4CA483} - C:\Program Files\RXToolBar\sfcont.dll (file missing)
O2 - BHO: BHObj Class - {8F4E5661-F99E-4B3E-8D85-0EA71C0748E4} - C:\WINDOWS\wsem303.dll
O2 - BHO: BAHelper Class
O3 - Toolbar: YourSiteBar - {86227D9C-0EFE-4f8a-AA55-
O4 - HKLM\..\Run: [SiXPack] SiXPack.exe /minimize
O4 - HKLM\..\Run: [NI.UWFX5LP_0001_0803] "C:\Documents and Settings\SEVERIN\Bureaublad\WFXScan.exe"/BEFOREINSTALL
O4 - HKLM\..\Run: [IST Service] C:\Program Files\ISTsvc\istsvc.exe
O4 - HKLM\..\Run: [djQeOsbfd] C:\WINDOWS\teqdqo.exe
O4 - HKLM\..\Run: [SurfAccuracy] C:\Program Files\SurfAccuracy\SAcc.exe
O4 - HKLM\..\Run: [Internet Optimizer] "C:\Program Files\Internet Optimizer\optimize.exe"
O4 - HKLM\..\Run: [Power Scan] C:\Program Files\Power Scan\powerscan.exe
O4 - HKLM\..\Run: [Hdxqqs] c:\Program Files\Eekexsr\Hijoxk.exe
O4 - HKLM\..\Run: [Dpmpcu] c:\Program Files\Mluhhjt\Iaxl.exe
O9 - Extra button: SideFind - {10E42047-DEB9-4535-A118-B3F6EC39B807} - C:\Program Files\SideFind\sidefind.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
O9 - Extra button: PICgrabber - {4964E240-D53C-11D5-BDA9-444553540000} - C:\Program Files\PICgrabber\PICGRABBER.EXE (HKCU)
O9 - Extra 'Tools' menuitem: PICgrabber - Movie&Image Search/Download Software - {4964E240-D53C-11D5-BDA9-444553540000} - C:\Program Files\PICgrabber\PICGRABBER.EXE (HKCU)
O16 - DPF: {1754A1BA-A1DF-4F10-B199-AA55AA1A120F} (InstallerBehaviorFactory Class) - https://signup.msn.com/pages/MsnInstC.cab
O16 - DPF: {193C772A-87BE-4B19-A7BB-445B226FE9A1} (ewidoOnlineScan Control) - http://download.ewido.net/ewidoOnlineScan.cab
O16 - DPF: {30528230-99f7-4bb4-88d8-fa1d4f56a2ab} (YInstStarter Class) - C:\Program Files\Yahoo!\Common\yinsthelper.dll
O16 - DPF: {42F2C9BA-614F-47C0-B3E3-ECFD34EED658} (Installer Class) - http://www.ysbweb.com/ist/softwares/v4.0/ysb_cracks.cab
O16 - DPF: {4D7F48C0-CB49-4EA6-97D4-04F4EACC2F3B} - http://sib1.od2.com/common/Member/ClientInstall/10.20.0002/OCI/setup.exe
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1124561289794
O16 - DPF: {7C559105-9ECF-42B8-B3F7-832E75EDD959} (Installer Class) - http://www.tbcode.com/ist/softwares/v4.0/0006_regular.cab
O16 - DPF: {8C875948-9C60-4381-9248-0DF180542D53} - http://installs.hotbar.com/installs/hbtools/programs/hbtools.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/MsnMessengerSetupDownloader.cab
O16 - DPF: {FC67BB52-AAB6-4282-9D51-2DAFFE73AFD0} - http://download.spyspotter.com/spyspotter/spsp29953.01noopt/spyspottercabinstall.cab
O16 - DPF: {FE0BD779-44EE-4A4B-AA2E-743C63F2E5E6} (IWinAmpActiveX Class) - http://pdl.stream.aol.com/downloads/aol/unagi/ampx_en_dl.cab

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avast! Edition Familiale:
Un antivirus gratuit et en français!
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1.recherche ces fichiers sur ton pc et supprime les:
SiXPack.exe
WFXScan.exe
istsvc.exe
teqdqo.exe
SAcc.exe
optimize.exe"
powerscan.exe

2.Met à jour ton windows:
Demarrer, tous les programmes, windows update, puis laisse toi guider.

3.telecharge ces logiciels puis fait un scan avec chacuns:

SpyBot - Search & Destroy en français:
Spybot Search & Destroy

Ad-Aware SE Personal:
Ad-aware

a² free:
a² free

Puis après seulement tout ça remet un rapport hijack s'il te plait.