I have a valid activated 8.1 Pro + WMC system and need to do several re-installs on the same partition and hardware to test some unattended scripts for customization, etc. When I reinstall, there is no network connectivity until I install the proper drivers. I am currently replacing the install data.dat and tokens.dat with the activated versions from my original install, after which I run slmgr -ipk with the original key without any errors, but the system shows not activated. I don't remember this being the case with Win8 doing the same thing. Apparently, just restoring the activated tokens and installing the same product key isn't enough to get back the previous activation status when offline. I can reactivate going online and that stays activated even after going back offline, but not after a re-install. I always have to reactivate online. Anyone have an idea what piece of the puzzle is missing to avoid this?