PC qui se bloque au bout de 3min

Bonjour,

Mon PC se bloque au bout de quelques minutes et je ne peux plus rien lancer, la bouton démarrer en bas à gauche ne marche plus, je peux cliquer sur mes icônes du bureau mais si je double click rien ne se passe.

J'ai fait un test de ma mémoire RAM, elle est bonne.

Ci-dessous le scan HiJackThis:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 13:13:51, on 27/04/2012
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)
Boot mode: Safe mode

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:\WINDOWS\Explorer.EXE
F:\Support informatique\HiJackThis.exe

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://desktop.presario.net/scripts/redirectors/presario/deskredir2.dll?s=consumer&ap=b201&c=1c02&lc=040c&ac
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://search.presario.net/scripts/redirectors/presario/srchredir2.dll?c=1c02&lc=040c&s=search&ap=b204
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://search.presario.net/scripts/redirectors/presario/srchredir2.dll?c=1c02&lc=040c&s=search&ap=b204
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://search.presario.net/scripts/redirectors/presario/srchredir2.dll?c=1c02&lc=040c&s=search&ap=b204
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://desktop.presario.net/scripts/redirectors/presario/deskredir2.dll?s=consumer&ap=b201&c=1c02&lc=040c&ac
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE NvQTwk,NvCplDaemon initialize
O4 - HKLM\..\Run: [CPQEASYACC] C:\Program Files\COMPAQ\Easy Access Button Support\StartEAK.exe
O4 - HKLM\..\Run: [AdaptecDirectCD] "C:\Program Files\Roxio\Easy CD Creator 5\DirectCD\DirectCD.exe"
O4 - HKLM\..\Run: [srmclean] C:\Cpqs\Scom\srmclean.exe
O4 - HKLM\..\Run: [RealTray] C:\Program Files\Real\RealPlayer\realplay.exe SYSTEMBOOTHIDEPLAYER
O4 - HKLM\..\Run: [Smapp] C:\Program Files\Analog Devices\SoundMAX\Smtray.exe
O4 - HKLM\..\Run: [RealJukeboxSystray] "C:\Program Files\Real\RealJukebox\tsystray.exe"
O4 - HKLM\..\Run: [Office_scan] \\JO-LINDIEN\offscan$\PCCSRV\autopcc.exe
O4 - HKLM\..\Run: [OfficeScanNT Monitor] "C:\Program Files\Trend Micro\OfficeScan Client\pccntmon.exe" -HideWindow
O4 - HKLM\..\Run: [avast] "C:\Program Files\AVAST Software\Avast\avastUI.exe" /nogui
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: Démarrage d'Office.lnk = C:\Program Files\Microsoft Office\Office\OSA.EXE
O4 - Global Startup: Microsoft Recherche accélérée.lnk = C:\Program Files\Microsoft Office\Office\FINDFAST.EXE
O9 - Extra button: Sites Perso - {06FE5D05-8F11-11d2-804F-00105A133818} - http://compaqnet.ifrance.com/heberg/accueil (file missing)
O9 - Extra 'Tools' menuitem: Compaq France - {06FE5D05-8F11-11d2-804F-00105A133818} - http://compaqnet.ifrance.com/heberg/accueil (file missing)
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
O23 - Service: avast! Antivirus - AVAST Software - C:\Program Files\AVAST Software\Avast\AvastSvc.exe
O23 - Service: Scan en temps réel OfficeScanNT (ntrtscan) - Trend Micro Inc. - C:\Program Files\Trend Micro\OfficeScan Client\ntrtscan.exe
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Pare-feu OfficeScanNT (OfcPfwSvc) - Trend Micro Inc. - C:\Program Files\Trend Micro\OfficeScan Client\OfcPfwSvc.exe
O23 - Service: OfficeScanNT Listener (tmlisten) - Trend Micro Inc. - C:\Program Files\Trend Micro\OfficeScan Client\tmlisten.exe