When you Create A New Image within the Image Management, set image type to Multiple Partition Image - Single Disk (Not Resizable). This is my unattend.xml for Windows 7 Professional x86 and it does work with Dell Factory partition setup. What I did is registered the computer with the FOG server, booted the Dell factory install in win7, installed all the software I needed, put the unattend.xml in the C:\windows\system32\sysprep folder, syspreped, and started the image upload process.
<?xml version=“1.0” encoding=“utf-8”?>
<unattend xmlns=“urn:schemas-microsoft-com:unattend”>
<settings pass=“windowsPE”>
<component name=“Microsoft-Windows-Setup” processorArchitecture=“x86” publicKeyToken=“31bf3856ad364e35” language=“neutral” versionScope=“nonSxS” xmlns:wcm=“[url]http://schemas.microsoft.com/WMIConfig/2002/State[/url]” xmlns:xsi=“[url]http://www.w3.org/2001/XMLSchema-instance[/url]”>
<EnableFirewall>false</EnableFirewall>
<EnableNetwork>true</EnableNetwork>
<UseConfigurationSet>true</UseConfigurationSet>
</component>
</settings>
<settings pass=“generalize”>
<component name=“Microsoft-Windows-Security-SPP” processorArchitecture=“x86” publicKeyToken=“31bf3856ad364e35” language=“neutral” versionScope=“nonSxS” xmlns:wcm=“[url]http://schemas.microsoft.com/WMIConfig/2002/State[/url]” xmlns:xsi=“[url]http://www.w3.org/2001/XMLSchema-instance[/url]”>
<SkipRearm>1</SkipRearm>
</component>
<component name=“Microsoft-Windows-PnpSysprep” processorArchitecture=“x86” publicKeyToken=“31bf3856ad364e35” language=“neutral” versionScope=“nonSxS” xmlns:wcm=“[url]http://schemas.microsoft.com/WMIConfig/2002/State[/url]” xmlns:xsi=“[url]http://www.w3.org/2001/XMLSchema-instance[/url]”>
<PersistAllDeviceInstalls>true</PersistAllDeviceInstalls>
</component>
</settings>
<settings pass=“specialize”>
<component name=“Microsoft-Windows-Deployment” processorArchitecture=“x86” publicKeyToken=“31bf3856ad364e35” language=“neutral” versionScope=“nonSxS” xmlns:wcm=“[url]http://schemas.microsoft.com/WMIConfig/2002/State[/url]” xmlns:xsi=“[url]http://www.w3.org/2001/XMLSchema-instance[/url]”>
<ExtendOSPartition>
<Extend>true</Extend>
</ExtendOSPartition>
</component>
<component name=“Microsoft-Windows-Security-SPP-UX” processorArchitecture=“x86” publicKeyToken=“31bf3856ad364e35” language=“neutral” versionScope=“nonSxS” xmlns:wcm=“[url]http://schemas.microsoft.com/WMIConfig/2002/State[/url]” xmlns:xsi=“[url]http://www.w3.org/2001/XMLSchema-instance[/url]”>
<SkipAutoActivation>true</SkipAutoActivation>
</component>
<component name=“Microsoft-Windows-Shell-Setup” processorArchitecture=“x86” publicKeyToken=“31bf3856ad364e35” language=“neutral” versionScope=“nonSxS” xmlns:wcm=“[url]http://schemas.microsoft.com/WMIConfig/2002/State[/url]” xmlns:xsi=“[url]http://www.w3.org/2001/XMLSchema-instance[/url]”>
<ComputerName>Computer Name</ComputerName>
<DisableAutoDaylightTimeSet>false</DisableAutoDaylightTimeSet>
<ShowWindowsLive>false</ShowWindowsLive>
<TimeZone>(GMT-06:00) Central Time (US and Canada)</TimeZone>
</component>
</settings>
<settings pass=“oobeSystem”>
<component name=“Microsoft-Windows-International-Core” processorArchitecture=“x86” publicKeyToken=“31bf3856ad364e35” language=“neutral” versionScope=“nonSxS” xmlns:wcm=“[url]http://schemas.microsoft.com/WMIConfig/2002/State[/url]” xmlns:xsi=“[url]http://www.w3.org/2001/XMLSchema-instance[/url]”>
<InputLocale>en-us</InputLocale>
<SystemLocale>en-us</SystemLocale>
<UILanguage>en-us</UILanguage>
<UILanguageFallback>en-us</UILanguageFallback>
<UserLocale>en-us</UserLocale>
</component>
<component name=“Microsoft-Windows-Shell-Setup” processorArchitecture=“x86” publicKeyToken=“31bf3856ad364e35” language=“neutral” versionScope=“nonSxS” xmlns:wcm=“[url]http://schemas.microsoft.com/WMIConfig/2002/State[/url]” xmlns:xsi=“[url]http://www.w3.org/2001/XMLSchema-instance[/url]”>
<OOBE>
<HideEULAPage>true</HideEULAPage>
<NetworkLocation>Work</NetworkLocation>
<ProtectYourPC>3</ProtectYourPC>
<SkipMachineOOBE>true</SkipMachineOOBE>
<SkipUserOOBE>true</SkipUserOOBE>
<HideWirelessSetupInOOBE>true</HideWirelessSetupInOOBE>
</OOBE>
<TimeZone>(GMT-06:00) Central Time (US and Canada)</TimeZone>
<ShowWindowsLive>false</ShowWindowsLive>
</component>
</settings>
<cpi:OfflineImage cpi:source=“catalog:c:/images/install_windows 7 professional.clg” xmlns:cpi=“urn:schemas-microsoft-com:cpi” />
</unattend>