I know they aren't typical install cds, but shouldn't be some refference of the pk on one of those two discs? Or on th hp_recovery partition??!? No winnt.sif, no unattend.txt. Ho does that os activate if the c drive gets formatted and the os reinstalled by booting the 1st dvd. I didn't figure this out yet. The same for F11 hp_recovery process. What I can understand is probably in the HP world, "format C:" is not an option. You have to start the recovery process either by F11 or booting off the dvd. Then the pk, winnt.sif are backed up from the existing installation and used for the new install. Else there should be some reference to the pk either on the discs or the on the recovery partition. atolica