Impossibilite d'executer skype. Application Win 32 non valide

Bonjour,
J'ai demande un rapport d'analyse par HijackThis pour essayer de resoudre un probleme de telechargement de Skype.
Une fenetre apparait:
.../skypesetup.exe is not a valid Win32 application
Voici l'analyse de Hijackthis:


Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 5:53:38 AM, on 8/29/2009
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
Boot mode: Normal

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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\WIDCOMM\Bluetooth Software\bin\btwdins.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\acs.exe
C:\Program Files\TOSHIBA\ConfigFree\CFSvcs.exe
C:\WINDOWS\system32\DVDRAMSV.exe
C:\Program Files\McAfee\SiteAdvisor\McSACore.exe
C:\PROGRA~1\McAfee\MSC\mcmscsvc.exe
c:\PROGRA~1\COMMON~1\mcafee\mna\mcnasvc.exe
c:\PROGRA~1\COMMON~1\mcafee\mcproxy\mcproxy.exe
C:\PROGRA~1\McAfee\VIRUSS~1\mcshield.exe
C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\mdm.exe
C:\Program Files\McAfee\MPF\MPFSrv.exe
C:\WINDOWS\system32\svchost.exe
c:\TOSHIBA\IVP\swupdate\swupdtmr.exe
C:\Program Files\TOSHIBA\TOSHIBA Applet\TAPPSRV.exe
C:\WINDOWS\system32\TODDSrv.exe
C:\WINDOWS\system32\SearchIndexer.exe
c:\PROGRA~1\mcafee.com\agent\mcagent.exe
C:\Program Files\ATI Technologies\ATI.ACE\cli.exe
C:\Program Files\TOSHIBA\ConfigFree\NDSTray.exe
C:\Program Files\Toshiba\Toshiba Applet\thotkey.exe
C:\Program Files\TOSHIBA\TOSHIBA Direct Disc Writer\ddwmon.exe
C:\WINDOWS\RTHDCPL.EXE
C:\Program Files\Synaptics\SynTP\SynTPEnh.exe
C:\Program Files\ltmoh\Ltmoh.exe
C:\WINDOWS\AGRSMMSG.exe
C:\Program Files\Toshiba\Tvs\TvsTray.exe
C:\Program Files\TOSHIBA\Touch and Launch\PadExe.exe
C:\Program Files\TOSHIBA\TOSHIBA Controls\TFncKy.exe
C:\WINDOWS\system32\TPSMain.exe
C:\Program Files\TOSHIBA\TOSHIBA Zooming Utility\SmoothView.exe
C:\toshiba\ivp\ism\pinger.exe
C:\Program Files\Synaptics\SynTP\SynToshiba.exe
C:\WINDOWS\system32\TPSBattM.exe
C:\Program Files\Java\jre1.6.0_07\bin\jusched.exe
C:\Program Files\QuickTime\QTTask.exe
C:\Program Files\Canon\MyPrinter\BJMyPrt.exe
C:\Program Files\Microsoft Office\Office12\GrooveMonitor.exe
C:\Program Files\TOSHIBA\TOSCDSPD\toscdspd.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Windows Live\Messenger\msnmsgr.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\WIDCOMM\Bluetooth Software\BTTray.exe
C:\WINDOWS\system32\RAMASST.exe
C:\Program Files\Windows Desktop Search\WindowsSearch.exe
C:\Program Files\OpenOffice.org 3\program\soffice.exe
C:\Program Files\OpenOffice.org 3\program\soffice.bin
C:\PROGRA~1\McAfee\VIRUSS~1\mcsysmon.exe
C:\Program Files\ATI Technologies\ATI.ACE\cli.exe
C:\Program Files\ATI Technologies\ATI.ACE\cli.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Java\jre1.6.0_07\bin\jucheck.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

O23 - Service: Swupdtmr - Unknown owner - c:\TOSHIBA\IVP\swupdate\swupdtmr.exe
O23 - Service: TOSHIBA Application Service (TAPPSRV) - TOSHIBA Corp. - C:\Program Files\TOSHIBA\TOSHIBA Applet\TAPPSRV.exe
O23 - Service: TOSHIBA Optical Disc Drive Service (TODDSrv) - TOSHIBA Corporation - C:\WINDOWS\system32\TODDSrv.exe

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End of file - 3348 bytes


Merci de m'aidre a resoudre mon probleme