Enable local Admin account by RIS

How can I enable automatically the local admin-account? this is my riprep.sif
file:

[data]
floppyless = "1"
msdosinitiated = "1"
OriSrc = "\\%SERVERNAME%\RemInst\%INSTALLPATH%\%MACHINETYPE %"
OriTyp = "4"
LocalSourceOnCD = 1
DisableAdminAccountOnDomainJoin = 1

[SetupData]
OsLoadOptions = "/noguiboot /fastdetect"
SetupSourceDevice
="\Device\LanmanRedirector\%SERVERNAME%\RemInst\%I NSTALLPATH%"
SysPrepDevice="\Device\LanmanRedirector\%SERVERNAM E%\RemInst\%SYSPREPPATH%
SysPrepDriversDevice="\Device\LanmanRedirector\%SE RVERNAME%\RemInst\%SYSPREPDRIVERS%"

[Unattended]
OemPreinstall = no
FileSystem = LeaveAlone
ExtendOEMPartition = 0
TargetPath = \WINDOWS
OemSkipEula = yes
InstallFilesPath = "\\%SERVERNAME%\RemInst\%INSTALLPATH%\%MACHINETYPE %"
LegacyNIC = 1

[UserData]
ProductKey = "*****-*****-*****-*****-*****"
FullName = "Name"
OrgName = "Company"
ComputerName = "%machinename%"

[GuiUnattended]
OemSkipWelcome = 1
OemSkipRegional = 1
TimeZone = 110
AdminPassword = "Password"


[Display]
BitsPerPel = 16
XResolution = 800
YResolution = 600
VRefresh = 60

[Networking]

[NetServices]
MS_Server=params.MS_PSched

[Identification]
DomainAdmin = admin
DomainAdminPassword = "Password"
JoinDomain = "Domain"

[RemoteInstall]
Repartition = Yes
UseWholeDisk = Yes



[OSChooser]
Description="Microsoft Windows XP Professional Dutch"
Help="Microsoft Windows XP Professional Dutch incl. SP2, Virusscanner,
Citrix"
LaunchFile="%INSTALLPATH%\%MACHINETYPE%\templates\ startrom.com"
ImageType=SYSPREP
Version="5.1 (2600)"
SysPrepSystemRoot="Mirror1\UserData\WINDOWS"
HalName=halaacpi.dll
ProductType=0