[kukris]

With OEM versions neither the switch setup.exe /iw nor ShowEula=0 in the msbatch.inf don't help, but Ypsos posted his msbatch.inf and with that it works also for OEM versions.

http://www.msfn.org/...showtopic=21230

In the section [OPKInstall] he added the following lines:

HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion","ProductId",,12345-OEM-1234567-12345
HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion","ProductKey",,ABCDE-FGHIJ-KLMNO-PQRST-UVWXY
HKLM,"Software\Microsoft\Windows\CurrentVersion","RegisteredOwner",,User
HKLM,"Software\Microsoft\Windows\CurrentVersion","RegisteredOrganization",,none

Insert your Product Key and it should work.
Don't forget to add the section to your Install section

[Install]
AddReg=OPKInstall,.....

I also use ShowEula=0 in the [Setup] section and the switch /iw for setup.exe (along with others), though I don't know if it's necessary.