Well. I will give it a shot. Yes it is a Dell. I do these reinstalls with Dell hardware all the time, I've just never switched the architecture. They are all are 7 Professional so that shouldn't pose to be a problem. Any other thoughts before I waste my time?
As far as activation, with the Dell OEM, its almost like the installation can tell it is being installed on a Dell computer. Must have something to do with the Mobo. But they never really appear to activate. This is my experience with XP at least. We just starting buying machines with Win 7 license, so I'm pretty excited.