I mean the ones when you install they automatically install the certs & key and activate on their own.
Do you have an SLIC BIOS? Because there will not be any official OEM DVD wich will isntall an loader for you ^^ I made my own OEM AIO DVD which installs and loader automatically after Windows isntallation ends, so it is activated after install.
Then why dont you make your own OEM DVD? You just need the Retail ISO and make the Folder "Sources\$OEM$\$$\System32\OEM\PlaceCertNameHere.xrm-ms Then you just have to install Windows 7 with the OEM key. That's it.
Just used a lo*der and script from here. Based on Hazar's lo*der, but of course i removed the "Pause" commands, because i think then it won't work, coz you can't push any button when installing ^^ Either you place the cert in "sources\$OEM$\$$\SYSTEM32\OEM" and it will be automatically installed (if you want to enter the OEM key at your own during install, or if you use AutoUnattended.xml/include serial to the install.wim) , or you place it together with the lo*der in "sources\$OEM$\$$\SETUP\SCRIPTS" so that the script will install it together with the serial. The script must have the name setupcomplete.cmd. OF course i had to edit the script to work with german language because of the "System Reserved" partition. Also i had to enter the full paths to the files e.g. ""%SYSTEMROOT%\SETUP\Scripts\bootinst.exe"" because else they won't be found.
I'm having trouble getting mine to work, do you mind posting up your setupcomplete.cmd (just quote the contents). Cheers.