I currently have xp home installed on my pc. I want to install xp pro over
it, but would like to put xp home on my older pc. Because of activation, I'm
not sure if I can just install xp home on the old machine.

The eula for xp home says that I may "move the software to a different
workstation computer". Does this mean physically moving the hard drive?

Is there a way to put xp home on the old machine?

P.