Fichier de log :
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Log started 10/20/2013 at 15:18:22
Preferred installation mode : qt
Trying to init installer in mode qt
Mode qt successfully initialized
Executing C:\Users\Marc\AppData\Local\Temp/postgresql_installer_3d66770533/temp_check_comspec.bat
Script exit code: 0

Script output:
"test ok"

Script stderr:

Could not find registry key HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.3 Data Directory. Setting variable iDataDirectory to empty value
Could not find registry key HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.3 Base Directory. Setting variable iBaseDirectory to empty value
Could not find registry key HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.3 Service ID. Setting variable iServiceName to empty value
Could not find registry key HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.3 Service Account. Setting variable iServiceAccount to empty value
Could not find registry key HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.3 Super User. Setting variable iSuperuser to empty value
Could not find registry key HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.3 Branding. Setting variable iBranding to empty value
Could not find registry key HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.3 Version. Setting variable brandingVer to empty value
Could not find registry key HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.3 Shortcuts. Setting variable iShortcut to empty value
Could not find registry key HKEY_LOCAL_MACHINE\SOFTWARE\PostgreSQL\Installations\postgresql-9.3 DisableStackBuilder. Setting variable iDisableStackBuilder to empty value
[15:18:27] Existing base directory:
[15:18:27] Existing data directory:
[15:18:27] Using branding: PostgreSQL 9.3
[15:18:27] Using Super User: postgres and Service Account: NT AUTHORITY\NetworkService
[15:18:27] Using Service Name: postgresql-9.3
Executing cscript //NoLogo "C:\Users\Marc\AppData\Local\Temp\postgresql_installer_3d66770533\prerun_checks.vbs"
Script exit code: 1

Script output:
Erreur CScript: Impossible de trouver le moteur de script "VBScript" pour le script "C:\Users\Marc\AppData\Local\Temp\postgresql_installer_3d66770533\prerun_checks.vbs".

Script stderr:
Program ended with an error exit code

Erreur dans l'exécution de cscript //NoLogo "C:\Users\Marc\AppData\Local\Temp\postgresql_installer_3d66770533\prerun_checks.vbs" : Program ended with an error exit code
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Des idées.
Merci