I have made entry into Unattended file to stop the popup of Server Manager during first starup of windows 2008 R2. However it is not working out, but Disable Initial OCnfiguration task window is working fine. Below is my Unattended.xml file:
<unattend xmlns="urn:schemas-microsoft-com:unattend"><settings pass="windowsPE">
<component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" language="neutral" name="Microsoft-Windows-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS">
<ImageInstall>
<OSImage>
<WillShowUI>OnError</WillShowUI>
<InstallTo>
<DiskID>0</DiskID>
<PartitionID>1</PartitionID>
</InstallTo>
<InstallFrom>
<Path>K:\win28x64\Sources\install.wim</Path>
<MetaData>
<Key>/image/name</Key>
<Value>Windows Server 2008 R2 SERVERENTERPRISE</Value>
</MetaData>
</InstallFrom>
</OSImage>
</ImageInstall>
<UpgradeData>
<Upgrade>false</Upgrade>
</UpgradeData>
<Display>
<ColorDepth>16</ColorDepth>
<HorizontalResolution>1024</HorizontalResolution>
<RefreshRate>60</RefreshRate>
<VerticalResolution>768</VerticalResolution>
</Display>
<ComplianceCheck>
<DisplayReport>OnError</DisplayReport>
</ComplianceCheck>
<UserData>
<AcceptEula>true</AcceptEula>
</UserData>
</component>
<component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" language="neutral" name="Microsoft-Windows-International-Core-WinPE" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS">
<SetupUILanguage>
<UILanguage>en-US</UILanguage>
</SetupUILanguage>
<InputLocale>0409:00000409</InputLocale>
<SystemLocale>en-US</SystemLocale>
<UILanguage>en-US</UILanguage>
<UserLocale>en-US</UserLocale>
</component>
</settings>
<settings pass="specialize"><component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" language="neutral" name="Microsoft-Windows-ServerManager-SvrMgrNc" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS">
<DoNotOpenServerManagerAtLogon>true</DoNotOpenServerManagerAtLogon>
</component><component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" language="neutral" name="Microsoft-Windows-OutOfBoxExperience" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS">
<DoNotOpenInitialConfigurationTasksAtLogon>true</DoNotOpenInitialConfigurationTasksAtLogon>
</component>
<component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" language="neutral" name="Microsoft-Windows-Shell-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS">
<ComputerName>Siddu</ComputerName>
<RegisteredOrganization/>
<RegisteredOwner>BL-Target</RegisteredOwner>
<DoNotCleanTaskBar>true</DoNotCleanTaskBar>
<ShowWindowsLive>false</ShowWindowsLive>
<BluetoothTaskbarIconEnabled>false</BluetoothTaskbarIconEnabled>
<CopyProfile>false</CopyProfile>
<DisableAutoDaylightTimeSet>true</DisableAutoDaylightTimeSet>
<StartPanelOff>false</StartPanelOff>
</component>
<component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" language="neutral" name="Microsoft-Windows-UnattendedJoin" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS">
<Identification>
<JoinWorkgroup>Siddu</JoinWorkgroup>
<UnsecureJoin>false</UnsecureJoin>
<DebugJoin>false</DebugJoin>
</Identification>
</component>
<component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" language="neutral" name="Networking-MPSSVC-Svc" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS">
<FirewallGroups/>
<DomainProfile_EnableFirewall>false</DomainProfile_EnableFirewall>
<PrivateProfile_EnableFirewall>false</PrivateProfile_EnableFirewall>
<PublicProfile_EnableFirewall>false</PublicProfile_EnableFirewall>
<PrivateProfile_DisableNotifications>true</PrivateProfile_DisableNotifications>
</component>
<component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" language="neutral" name="Microsoft-Windows-TCPIP" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS">
<Interfaces>
<Interface wcm:action="add">
<Ipv4Settings>
<DhcpEnabled>false</DhcpEnabled>
</Ipv4Settings>
<Ipv6Settings>
<DhcpEnabled>true</DhcpEnabled>
</Ipv6Settings>
<UnicastIpAddresses>
<IpAddress wcm:action="add" wcm:keyValue="1">192.168.79.171/24</IpAddress>
</UnicastIpAddresses>
<Identifier>PROV_DEVICE_MAC_ADD</Identifier>
<Routes>
<Route wcm:action="add">
<Identifier>0</Identifier>
<Prefix>0.0.0.0/0</Prefix>
<NextHopAddress>192.168.79.0</NextHopAddress>
<Metric>20</Metric>
</Route>
</Routes>
</Interface>
</Interfaces>
</component>
<component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" language="neutral" name="Microsoft-Windows-DNS-Client" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS">
<Interfaces>
<Interface wcm:action="add">
<DNSServerSearchOrder>
<IpAddress wcm:action="add" wcm:keyValue="1">192.168.79.168</IpAddress>
</DNSServerSearchOrder>
<EnableAdapterDomainNameRegistration>true</EnableAdapterDomainNameRegistration>
<Identifier>PROV_DEVICE_MAC_ADD</Identifier>
</Interface>
</Interfaces>
</component>
</settings>
<settings pass="oobeSystem">
<component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" language="neutral" name="Microsoft-Windows-Shell-Setup" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS">
<UserAccounts>
<AdministratorPassword>
<Value>PROV_WIN_ADMIN_PASSWORD</Value>
<PlainText>true</PlainText>
</AdministratorPassword>
</UserAccounts>
<AutoLogon>
<Enabled>true</Enabled>
<Username>Administrator</Username>
<Password>
<Value>PROV_WIN_ADMIN_PASSWORD</Value>
<PlainText>true</PlainText>
</Password>
<LogonCount>3</LogonCount>
</AutoLogon>
<Display>
<ColorDepth>32</ColorDepth>
<HorizontalResolution>1024</HorizontalResolution>
<RefreshRate>60</RefreshRate>
<VerticalResolution>768</VerticalResolution>
</Display>
<FirstLogonCommands>
<SynchronousCommand wcm:action="add">
<CommandLine>c:\BLProv\wrapper.bat</CommandLine>
<Description>Lite Touch new OS</Description>
<Order>1</Order>
</SynchronousCommand>
</FirstLogonCommands>
<OOBE>
<HideEULAPage>true</HideEULAPage>
<NetworkLocation>Other</NetworkLocation>
<ProtectYourPC>3</ProtectYourPC>
<SkipUserOOBE>true</SkipUserOOBE>
<SkipMachineOOBE>true</SkipMachineOOBE>
</OOBE>
<RegisteredOrganization/>
<RegisteredOwner>BL-Target</RegisteredOwner>
<TimeZone>Dateline Standard Time</TimeZone>
</component>
<component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" language="neutral" name="Microsoft-Windows-International-Core" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS">
<InputLocale>0409:00000409</InputLocale>
<SystemLocale>en-US</SystemLocale>
<UILanguage>en-US</UILanguage>
<UserLocale>en-US</UserLocale>
</component>
</settings>
<settings pass="offlineServicing">
<component xmlns:wcm="http://schemas.microsoft.com/WMIConfig/2002/State" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" language="neutral" name="Microsoft-Windows-PnpCustomizationsNonWinPE" processorArchitecture="amd64" publicKeyToken="31bf3856ad364e35" versionScope="nonSxS">
<DriverPaths>
<PathAndCredentials wcm:action="add" wcm:keyValue="1">
<Path>C:\Drivers</Path>
</PathAndCredentials>
<PathAndCredentials wcm:action="add" wcm:keyValue="2">
<Path>X:\Drivers</Path>
</PathAndCredentials>
</DriverPaths>
</component>
</settings>
<cpi:offlineImage xmlns:cpi="urn:schemas-microsoft-com:cpi" cpi:source="wim:K:\win28x64\sources\install.wim#Windows Server 2008 R2 SERVERENTERPRISE"/>
</unattend>