Virus usbctl.exe

Bonjour,
J'ai un cheval de troie sur le fichier usbctl.exe ( C:\WINDOWS\System32\usbctl.exe) .............
Impossible de le supprimer .... il me fait vraiment ch*er et mes recherches sur le net ne donnent rien :'(
Voici mon rapport hijackthis :

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 00:50:31, on 24/09/2009
Platform: Unknown Windows (WinNT 6.01.3004)
MSIE: Internet Explorer v8.00 (8.00.7100.0000)
Boot mode: Normal

Running processes:
C:\Windows\system32\Dwm.exe
C:\Windows\system32\taskhost.exe
C:\Windows\Explorer.EXE
C:\Windows\SOUNDMAN.EXE
C:\Program Files\Avira\AntiVir Desktop\avgnt.exe
C:\Program Files\Razer\Lachesis\razerhid.exe
C:\Program Files\Razer\Lachesis\OSD.exe
C:\Program Files\Razer\Lachesis\razertra.exe
C:\Program Files\Razer\Lachesis\razerofa.exe
C:\Program Files\Steam\Steam.exe
C:\Program Files\Mumble\bin\dbus-daemon.exe
C:\Windows\system32\conhost.exe
C:\Users\Dimitri\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Dimitri\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Dimitri\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Program Files\Windows Media Player\wmplayer.exe
C:\Program Files\Malwarebytes' Anti-Malware\mbam.exe
C:\Users\Dimitri\AppData\Local\Google\Chrome\Application\chrome.exe
C:\Users\Dimitri\HiJackThis.exe
C:\Windows\system32\SearchFilterHost.exe

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 = https://www.google.fr/?gws_rd=ssl
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 = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.msn.com/fr-fr/?ocid=iehp
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: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: Programme d'aide de l'Assistant de connexion Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [avgnt] "C:\Program Files\Avira\AntiVir Desktop\avgnt.exe" /min
O4 - HKLM\..\Run: [Lachesis] C:\Program Files\Razer\Lachesis\razerhid.exe
O4 - HKCU\..\Run: [Google Update] "C:\Users\Dimitri\AppData\Local\Google\Update\GoogleUpdate.exe" /c
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')
O13 - Gopher Prefix:
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O23 - Service: a-squared Free Service (a2free) - Emsi Software GmbH - C:\Program Files\a-squared Free\a2service.exe
O23 - Service: Avira AntiVir Planificateur (AntiVirSchedulerService) - Avira GmbH - C:\Program Files\Avira\AntiVir Desktop\sched.exe
O23 - Service: Avira AntiVir Guard (AntiVirService) - Avira GmbH - C:\Program Files\Avira\AntiVir Desktop\avguard.exe
O23 - Service: NMSAccessU - Unknown owner - C:\Program Files\CDBurnerXP\NMSAccessU.exe
O23 - Service: NVIDIA Display Driver Service (nvsvc) - NVIDIA Corporation - C:\Windows\system32\nvvsvc.exe
O23 - Service: Steam Client Service - Valve Corporation - C:\Program Files\Common Files\Steam\SteamService.exe
O23 - Service: Microsoft USB Bus Controller (usbctl) - Unknown owner - C:\Windows\system32\usbctl.exe (file missing)