Thanks Tom,
I don’t find any product key staying in my unattend.xml file (the one in c:\windows\system32\sysprep)
Do you think the product key used for activating the Windows image can be the problem?
<?xml version="1.0" encoding="utf-8"?>
<!--This answer file generated by RT Seven Lite-->
<unattend xmlns="urn:schemas-microsoft-com:unattend">
<settings pass="windowsPE">
<component name="Microsoft-Windows-International-Core-WinPE" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="NonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<SetupUILanguage>
<UILanguage>fr-FR</UILanguage>
</SetupUILanguage>
<InputLocale>040c:0000040c</InputLocale>
<UserLocale>fr-FR</UserLocale>
<UILanguage>fr-FR</UILanguage>
<SystemLocale>fr-FR</SystemLocale>
</component>
<component name="Microsoft-Windows-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="NonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<ImageInstall>
<OSImage>
<InstallFrom>
<MetaData wcm:action="add">
<Key>/IMAGE/NAME</Key>
<value>Windows 7 PROFESSIONAL</value>
</MetaData>
</InstallFrom>
<InstallToAvailablePartition>false</InstallToAvailablePartition>
<WillShowUI>OnError</WillShowUI>
</OSImage>
</ImageInstall>
<UserData>
<Organization>Courcouronnes</Organization>
<FullName>Courcouronnes</FullName>
<AcceptEula>true</AcceptEula>
</UserData>
<UseConfigurationSet>true</UseConfigurationSet>
</component>
</settings>
<settings pass="oobeSystem">
<component name="Microsoft-Windows-Shell-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="NonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<UserAccounts>
<LocalAccounts>
<LocalAccount wcm:action="add">
<Name>admin</Name>
<Group>Administrators</Group>
<Password>
<PlainText>false</PlainText>
<Value>bgBiAGEAMQAyADMAUABhAHMAcwB3AG8AcgBkAA==</Value>
</Password>
</LocalAccount>
</LocalAccounts>
<AdministratorPassword>
<Value>cwBlAGMAdQBhAGQAbQBBAGQAbQBpAG4AaQBzAHQAcgBhAHQAbwByAFAAYQBzAHMAdwBvAHIAZAA=</Value>
<PlainText>false</PlainText>
</AdministratorPassword>
</UserAccounts>
<AutoLogon>
<Password>
<Value>cwBlAGMAdQBhAGQAbQBQAGEAcwBzAHcAbwByAGQA</Value>
<PlainText>false</PlainText>
</Password>
<Enabled>true</Enabled>
<LogonCount>5</LogonCount>
<Username>Administrator</Username>
</AutoLogon>
<OOBE>
<NetworkLocation>Work</NetworkLocation>
<HideEULAPage>true</HideEULAPage>
<ProtectYourPC>1</ProtectYourPC>
<HideWirelessSetupInOOBE>true</HideWirelessSetupInOOBE>
<SkipMachineOOBE>true</SkipMachineOOBE>
<SkipUserOOBE>true</SkipUserOOBE>
</OOBE>
<DisableAutoDaylightTimeSet>false</DisableAutoDaylightTimeSet>
<TimeZone>Romance Standard Time</TimeZone>
<OEMInformation>
<Manufacturer>SI</Manufacturer>
<SupportHours>L:J 8h15-17h30 V:8h15-15h30</SupportHours>
<SupportPhone>XXXXXXXX</SupportPhone>
<SupportURL>https://obsidienne.courcouronnes.fr/glpi</SupportURL>
<Model>1337</Model>
<Logo>%systemroot%\system32\OOBE\courcouronnes.bmp</Logo>
</OEMInformation>
<ShowWindowsLive>false</ShowWindowsLive>
<RegisteredOrganization>Courcouronnes</RegisteredOrganization>
</component>
</settings>
<settings pass="specialize">
<component name="Microsoft-Windows-Shell-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="NonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<ComputerName>RENOMMER</ComputerName>
<CopyProfile>true</CopyProfile>
</component>
<component name="Microsoft-Windows-Security-Licensing-SLC-UX" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="NonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<SkipAutoActivation>true</SkipAutoActivation>
</component>
<component name="Microsoft-Windows-Deployment" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<RunSynchronous>
<RunSynchronousCommand wcm:action="add">
<Order>1</Order>
<Path>net user administrator /active:yes</Path>
</RunSynchronousCommand>
</RunSynchronous>
</component>
<component name="Microsoft-Windows-Security-SPP-UX" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<SkipAutoActivation>true</SkipAutoActivation>
</component>
</settings>
<settings pass="generalize">
<component name="Microsoft-Windows-Security-SPP" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<SkipRearm>1</SkipRearm>
</component>
<component name="Microsoft-Windows-Security-Licensing-SLC" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<SkipRearm>1</SkipRearm>
</component>
</settings>
<cpi:offlineImage cpi:source="wim:d:/sources/install.wim#Windows 7 PROFESSIONAL" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
</unattend>